Paris St Germain collected their first trophy of the season when Edinson Cavani's double secured a 2-1 victory against Olympique Lyon in the French League Cup final on Saturday.
United issued a statement defending the striker, saying there was no malicious intent behind Cavani's message.
Cavani is now embroiled in a controversy over a questionable social media post.
Cavani netted an opportunist 71st-minute equaliser after Allan Saint-Maximin gave the home side a seventh-minute lead with a fine individual effort, side-stepping two markers before he fired past De Gea.
Cavani suspended by FA for three games over use of racial term
Edinson Cavani's potential absence for Uruguay would be a severe blow to their hopes of beating France in the World Cup quarter-finals, according to his former team mate and French midfielder Blaise Matuidi.
Uruguay's FA will raise a formal complaint against Chilean defender Gonzalo Jara for provoking striker Edinson Cavani by sticking his finger up his backside during the hosts' 1-0 Copa America quarter-final win.
Paris St Germain achieved a unique domestic treble when Edinson Cavani's goal secured a 1-0 French Cup final victory over Ligue 2 team AJ Auxerre on Saturday.
Edinson Cavani silenced his critics when he scored four goals in Paris St Germain's 6-0 victory at Caen in Ligue 1 on Friday.
Striker Edinson Cavani scored a superb hat-trick to give Napoli a 3-1 home win over defending Serie A champions AC Milan on Sunday.
Uruguay forward Edinson Cavani scored twice to earn the South Americans a 2-1 win over European champions Portugal in their World Cup round of 16 clash on Saturday and set up a quarter-final against France.
Edinson Cavani enjoyed a memorable comeback after spending four weeks on the sidelines with a thigh injury as he scored in Paris St Germain's 2-0 win over Olympique Marseille on Sunday to help his side move eight points clear at the top of Ligue 1.
Uruguay's Edinson Cavani has always played second fiddle to his more illustrious attacking colleagues at country or club level but the long-haired marksman emerged out of those shadows with his twin strike in the World Cup round of 16 last week.
Forwards Kylian Mbappe and Edinson Cavani have been ruled out for Paris St Germain's opening Champions League group stage match against Real Madrid on Wednesday, the French Ligue 1 champions said.
Cavani, 31, scored two goals in the Round of 16 win over Portugal, then limped off with a calf injury and has been fighting to get fit in time for the showdown in Nizhny Novgorod.
Paris St Germain took a big step towards the Ligue 1 title when Edinson Cavani's hat-trick inspired them.
FIFA launched proceedings against the players who angrily harangued the referee after crashing out of the tournament in Qatar, despite beating Ghana 2-0 in their final group match on December 2.
Paris St Germain substitute Edinson Cavani, criticised by French media lacking composure in front of goal, responded in style to earn a 2-1 home win over Chelsea in their Champions League last-16 first leg on Tuesday.
While their nearest chasers lost, Olympique Lyonnais succumbing 2-1 at home to struggling Lille and Monaco falling 1-0 at Nantes after a last-gasp Lucas Lima thunderbolt, PSG marched on without ever hitting top gear.
A late header from Edinson Cavani gave Uruguay a 1-0 win over Copa America holders Chile which saw them snatch top spot in Group C at their opponents' expense and set up a quarter-final meeting with Peru.
Paris St Germain's Zlatan Ibrahimovic and Edinson Cavani each scored twice in a 4-0 win over Bastia as their reshuffled side opened up a three-point lead at the top of Ligue 1 on Saturday.
Paris St Germain have signed last season's Serie A top scorer Edinson Cavani from Napoli on a five-year contract, the French Ligue 1 champions said on Tuesday.
FIFA also opened proceedings against the Uruguayan Football Association (AUF) over potential breaches of fair play rules.
Paris Saint-Germain took a crucial advantage after beating Chelsea 2-1 in an entertaining UEFA Champions League Round of 16 first leg tie at the Parc des Princes in Paris on Tuesday.
Images from Sunday's action in the Premier League.
News of all that's transpired on and off the football field
Chile defender Gonzalo Jara's ban for provoking Edinson Cavani has been cut from three games to two, the governing body of South American football has said.
German club Mainz 05 are ready to offload Gonzalo Jara after the Chile international whipped up a storm at the Copa America by sticking his finger up the backside of an opponent before falling to the floor theatrically when the player retaliated.
A summary of sports events and sports persons, who made news on Tuesday
European champions Portugal came up against a superior version of themselves as they were knocked out of the World Cup by Uruguay on Saturday. Although Uruguay forward Edinson Cavani and Portugal's Cristiano Ronaldo will grab the headlines -- the former for his two brilliantly goals and the latter for what could well be his World Cup farewell -- Uruguay owed their 2-1 win to a superb all-round performance.
United are 16th in the standings with a game in hand heading into the international break.
Paris St Germain missed the chance to go top of Ligue 1 after they were held to a 1-1 draw at Lille on Wednesday as coach Laurent Blanc's decision to rest Zlatan Ibrahimovic backfired.
Chile defender Gonzalo Jara will miss the rest of the Copa America after being suspended for three matches for sticking his finger up an opponent's backside and feigning injury during a match.
Luis Suarez struck twice including a dramatic late winner to earn Uruguay a 2-1 victory over England in a pulsating World Cup Group D match on Thursday.
Chile bundled reigning champions Uruguay out of the Copa America with a 1-0 victory.
Though there's still a month left in the transfer window, most of the major deals have been completed. We take a look at the top 10 transfers so far.
Strikers Falcao, Alexis Sanchez and Edinson Cavani all scored as Colombia ate into Argentina's lead, Chile notched a second successive win and Uruguay revived their hopes in South American World Cup qualifying on Tuesday.
Juventus moved a step closer to a second successive Serie A title after winning 2-1 in a pulsating "derby of Italy" at Inter Milan on Saturday, while Edinson Cavani came off the bench to inspire Napoli to a thrilling 5-3 win at Torino.
Ezequiel Lavezzi and Edinson Cavani combined to spark Napoli's 3-1 comeback win over Chelsea in their Champions League last 16 first-leg match on Tuesday that deepened the gloom hanging over the London club.
Argentine teenager Mauro Icardi scored twice as Serie A leaders Juventus lost 2-1 at home to lowly 10-man Sampdoria and Edinson Cavani's hat-trick helped Napoli to a 4-1 win over AS Roma on Sunday.