Apex football body FIFA and the International Football Association Board (IFAB), which set the rules, have issued new guidelines ahead of the restart of the Bundesliga.
Bayer Leverkusen beat Freiburg 3-2 to edge closer to a first ever Bundesliga title.
Costa, Alba excluded from Spain squad
News of all that's transpired on and off the football field
After falling 2-0 down on the night, substitute Marcos Llorente struck twice in extra-time and Alvaro Morata added a late third to ensure a famous victory for Diego Simeone's side against a Liverpool team unbeaten in their last 25 home games in European competition.
Ajax wary of attacking Napoli.
Manchester City manager Pep Guardiola has confirmed he is interested in signing Everton's young centre back John Stones, who has been linked with a 50 million-pounds ($65.72 million) move to the Etihad Stadium.
PSG's Champions League tie with Newcastle is like a final, says Luis Enrique
Leaders Bayern Munich eased past VfB Stuttgart 2-0 on Saturday to grab their first win of the year, as did Borussia Dortmund who beat Freiburg 3-0 to climb off the bottom of the Bundesliga table.
United States coach Jurgen Klinsmann has turned to experience for next month's Copa America Centenario on home soil, but said he had to make some "very close, tight decisions" before announcing his 23-player squad on Saturday.
A summary of sports events and sports persons, who made news on Saturday
Bayern Munich coach Pep Guardiola will see out his three-year contract with the German champions, who are hopeful of an extension beyond 2016, club CEO Karl-Heinz Rummenigge said on Thursday.
'It was a great atmosphere, I am so pleased for all of the people who have had harder times with us this season'
Instead, Allegri said on Monday, he would throw on all his best attacking players in an attempt to outscore his opponents in the first leg at the Juventus stadium.
IMAGES from the UEFA Champions League matches played on Wednesday.
Arsenal captain Mikel Arteta will be out for the next three months after having a "successful" operation on the left ankle that has kept him sidelined since late November, the club said on Thursday.
Liverpool feel they beat any team in the world at the moment and will play without fear in the Champions League final against 12-times winners Real Madrid later this month, winger Sadio Mane has said.
Bayern Munich's Thomas Mueller scored a hat-trick as the undefeated champions crushed Eintracht Frankfurt 4-0 to open up a seven-point lead at the top.
Arjen Robben scored a 90th minute winner in their 2-1 victory at Mainz 05 on Friday to send Bundesliga leaders Bayern Munich into the winter break with a commanding 14-point lead.
Bayern Munich wasted a two-goal lead and needed a lucky 82nd- minute winner from Joshua Kimmich to beat Borussia Dortmund 3-2 in Germany's Super Cup on Wednesday and secure their fifth title of the year.
"It's not much better at the moment. With Daniel's injury we have to take it day by day, and see if he's better," Klopp told a news conference on Friday.
Champions Bayern Munich twice needed to come from a goal down to beat hosts Augsburg 3-2 on Friday courtesy of Kingsley Coman's two goals, and cut the gap with leaders Borussia Dortmund to two points.
Manchester United flirted with calamity before coasting into the Europa League last 16 as debutant Marcus Rashford helped them overcome an early blow with two goals in a 5-1 home victory over Midtjylland on Thursday.
Moritz Stoppelkamp scored an extraordinary goal from deep inside his own half, a Bundesliga record 83 metres, to cap a 2-0 win for upstarts Paderborn over Hanover 96 on Saturday, helping the promoted side go to of the table.
Bayern Munich humiliated former Bundesliga powerhouses Werder Bremen 7-0 on Saturday with Franck Ribery scoring twice and setting up another two as the champions kept up their seemingly unstoppable march towards another title.
Football action from across Europe in matches played on Saturday
Zlatan Ibrahimovic says he is excited by the prospect of playing alongside Wayne Rooney at Manchester United and described his new team mate as the "perfect partner for a striker".
Tuchel said he hoped left back Ben Chilwell will not require surgery and that the club will wait to see how the situation develops before deciding if they need cover for the position.
Runaway leaders Bayern Munich appeared to barely break sweat in a 4-0 win at Hanover 96 to chalk up their 14th Bundesliga win in a row on Sunday, leaving them a huge 19 points clear at the top.
The win lifted Hamburg, who needed a relegation playoff to stay up last season, to seventh on six points.
Monaco's firepower was far too hot to handle for Olympique de Marseille as the Principality side moved top of the French Ligue 1 standings with a 4-0 home win on Saturday.
German champions Bayern Munich sacked coach Carlo Ancelotti on Thursday, a day after they suffered a crushing 3-0 defeat to Paris St Germain in the Champions League.
Undefeated Bayern Munich stumbled to a 0-0 draw at Borussia Moenchengladbach on Sunday that ended a four-game winning streak in the league but they remain four points clear at the top.
Sergio Busquets called on Barcelona to sign more players after the club's 3-1 Spanish Super Cup defeat by Real Madrid on Sunday.
'Our plan is to put the best foot forward for the upcoming tournament and play good matches'
Liverpool manager Juergen Klopp is full of admiration for Leicester City's style of football which has propelled the Midlands club to the top of the Premier League.
Triple European champions Manchester United and their under-fire coach Louis van Gaal face a tricky task against little-known Midtjylland in the last 32 of the Europa League following Monday's draw.
IMAGES from Europa League matches played on Thursday.
Given the improvements at Chelsea and Arsenal, it will still be a significant achievement for United to secure a top four finish and in the Champions League, a decent run in the knockout stages would also be a sign of progress.
Juergen Klopp, who has breathed new life into Liverpool in his seven months in charge, would seal his place in the hearts of the club's supporters if he pulls off victory over Sevilla in Wednesday's Europa League final.
