The club did not give a timeframe on his return.
Coutinho has as many man-of-the match awards in this tournament as Neymar has different haircuts.
'There is no price limit to let him go or a price that we are ready to give in'
Reports in British media put the latest bid at 125 million euros.
Livepool striker and Dembele close in on Camp Nou move
The 24-year-old limped off the pitch in the first 15 minutes of the match at Vicarage Road and was replaced by Adam Lallana but manager Juergen Klopp said that the Brazilian had not been badly injured.
Philippe Coutinho scored a second half double and Everton added a cracking third as Brazil recovered from a sleepy start to beat Bolivia 3-0 in their Copa America opener on Friday.
Dramatic late strikes by Philippe Coutinho and Neymar gave Brazil their first win of the World Cup against Costa Rica in St Petersburg on Friday and broke Central American hearts by sending them out of the tournament.
After the Champions League game, Liverpool host Arsenal in the league on Sunday.
If anyone was still wondering why Liverpool spurned Barcelona's bids for Brazilian playmaker Philippe Coutinho, his part in Saturday's 3-2 win over Leicester City provided the answer.
Barcelona are keen to sign the Brazilian playmaker, who joined Liverpool from Inter Milan for 8.5 million pounds ($11.03 million) in 2013, and have already had an initial bid worth 80 million euros rejected by Liverpool last month.
Philippe Coutinho's versatility makes him a great acquisition for Barcelona, coach Ernesto Valverde said on Sunday as the Brazilian made his first public appearance at the Nou Camp following his 142-million-pound ($192.57-million) move from Liverpool.
Philippe Coutinho scored a spectacular first-half goal for Brazil in their World Cup Group E opener on Sunday, only for Steven Zuber to cancel it out after the break.
Coutinho, who arrived from Liverpool for a club record 165 million euros ($185.18 million) in January 2018, has so far shown little to suggest he will be able to compensate for Frenchman Ousmane Dembele's absence against Lyon in the UEFA Champions League tie.
Brazilian playmaker Philippe Coutinho scored on his first start for Liverpool who leapfrogged SwanseaCity into seventh place in the Premier League by crushing the below-strength Welsh side 5-0 at Anfield on Sunday.
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"When he has the ball at his feet, he can make things happen for himself and he can make things happen for other players. He is a very special player."
Raheem Sterling and Philippe Coutinho helped Liverpool reach the FA Cup fifth round.
Philippe Coutinho thumped home a second-half winner as Liverpool broke the resistance of Championship Blackburn Rovers to reach the FA Cup semi-finals with a gritty 1-0 replay victory on Wednesday.
Barcelona abandoned their hopes of signing Philippe Coutinho from Liverpool after the Merseyside club demanded 200 million euros ($237.14 million) for the Brazil attacking midfielder, the Liga side's director Albert Soler said.
Liverpool's Brazil midfielder Philippe Coutinho is on the verge of signing for La Liga leaders Barcelona in a club-record deal, according to Spanish media reports.
Philippe Coutinho scored twice as Liverpool recovered from an early deficit to beat struggling Premier League champions Chelsea 3-1 at Stamford Bridge on Saturday and pile more pressure on Blues manager Jose Mourinho.
Barcelona can no longer afford to shell out huge sums in transfer fees for top players like Erling Haaland and Kylian Mbappe, coach Xavi Hernandez said.
Liverpool manager Juergen Klopp will return to the dugout for Tuesday's FA Cup fourth-round replay at West Ham United after missing the draw with Sunderland due to illness and he hopes to be joined by Daniel Sturridge and Philippe Coutinho. The German, who said he would have to keep his emotions in check on the sidelines after being treated for an appendicitis at the weekend, confirmed that striker Divock Origi had also resumed training after undergoing knee surgery. "I had one not too good night but I feel good," Klopp told reporters on Monday. "I'm experienced enough to know. I'm not going to jump or something when I have a few holes in my body." Striker Sturridge, who was on the bench against Sunderland after two months out, would have played at the weekend if Liverpool had not been forced into making early changes due to injuries, Klopp said. Klopp identified midfielder Dimitri Payet as West Ham's key player.
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Holders Barcelona reached the King's Cup semi-finals with a 2-0 win over Espanyol on Thursday to overcome a first-leg deficit on a night when new signing Philippe Coutinho made his debut.
Two superb curling efforts from Jordan Henderson and Philippe Coutinho handed Liverpool a 2-1 home win against Manchester City in the Premier League on Sunday to deliver a thumping blow to Manuel Pellegrini's title aspirations.
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Trippier suspension temporarily halted by FIFA
News of all that's transpired on and off the football field
Featuring Neymar, Coutinho, Dembele, Pogba, Bale...
News of all that's transpired on and off the football field
When Barca and Neymar were at the peak of their powers in 2017, however, he shook world football by heading to PSG for a record-smashing 222 million euros ($269.89 million).
Members of Brazil's national team, which was knocked out of the 2018 World Cup, were applauded by fans greeting their arrival at Rio de Janeiro's international airport on Sunday.
Ousmane Dembele endured a rough start to his Barcelona career but the French winger appears to be finding his feet at a crucial time in the season.
First half goals from Philippe Coutinho and Neymar were followed by a third from Paulinho after 58 minutes to sink the Argentines and extend their winless run to four games.
Manchester City took a major step towards retaining their Premier League title with a 1-0 win over second-placed Chelsea on Saturday, opening up a 13-point lead at the top of the table for Pep Guardiola's side.
To see the major transfers in the English Premier League, Spanish La Liga, French Ligue 1, Italian Serie A and German Bundesliga in the January transfer window, click on the soccer ball (all transfer fees as reported by British media):
Philippe Coutinho grabbed a hat-trick as Brazil ramped up their Copa America campaign with a resounding 7-1 win over a hapless Haiti on Wednesday. Renato Augusto scored a brace and substitutes Lucas Lima and Gabriel also goaled for Brazi, while James Marcelin put in Haiti's consolation goal. The scoreline -- identical to Brazil's nightmare 7-1 defeat by Germany in the World Cup semi-final two years ago -- takes Brazil to the top of Group B with four points, ahead of the evening's second game between Peru and Ecuador. Coutinho got Brazil off to a positive start in the Camping World stadium with a goal after 14 minutes when he skipped past a defender and hammered home from 20 metres out. He doubled Brazil's lead 15 minutes later thanks to Jonas, who was on hand to poke a loose ball across goal and leave the Liverpool player with the simplest of tap-ins.
Barca won their fifth European Cup in 2015 and the signs of decline have been evident over the past five years since -- but no-one envisaged a fall as great as this.