Kevin De Bruyne is set to miss at least 10 weeks after scans revealed the Belgium international tore ligaments in his knee and ankle in the Capital One Cup semi-final victory over Everton on Wednesday. That would mean he would return to action in mid-April and his agent fears the Manchester City attacking midfielder could miss the European Championship as a result.

De Bruyne, who came on as a late substitute for Yaya Touré in City’s 3-1 win, appeared to catch his studs in the turf and twist his knee as he challenged Ramiro Funes Mori in injury time and was carried off on a stretcher.

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De Bruyne revealed on Twitter on Thursday night that he would not play for 10 weeks. “Just got back from the specialist. I’ll be out for around 10 weeks,” he Tweeted. “I’ll work hard on my recovery and hope to be back on the pitch asap. Thank you all for the supportive messages!”

Speaking to the Guardian earlier, his agent, Patrick De Koster, said they will discover more after further tests in the next few days whether he will play again this season.

“Kevin will be out for at least six weeks but it is too early to know more at this stage,” De Koster told the Guardian. “He’s confident. Of course he is a bit sad that he will miss so many important games like the Capital One Cup final and Champions League but Kevin would not be Kevin if he wasn’t already thinking about playing again for City.”

Asked whether the injuries – understood to be tears to the lateral ligament in his right knee and another to one of his ankle ligaments – could mean De Bruyne misses out on playing for Belgium at Euro 2016, De Koster added: “You never know. I’m not going to discuss that at the moment. All Kevin can do now is concentrate on getting better and we will see.”

In what had been an eventful game for the player signed from Wolfsburg in August for a club record £54m – he scored in the 70th minute after the officials missed the ball going over the byline in the buildup and crossed for Sergio Agüero to make it 3-1 on the night – City progressed 4-3 on aggregate and will meet Liverpool in the final at Wembley on 28 February.

The prognosis will be a blow for the manager, Manuel Pellegrini, with City still battling for trophies on four fronts. As well as missing the Capital One Cup final, De Bruyne, who has had 12 assists this season and created more chances than any other City player, will miss the Champions league last-16 tie against Dynamo Kyiv and league matches against the leaders Leicester, fourth-placed Tottenham as well as the Manchester derby on 20 March.

It is understood that De Bruyne will remain in Manchester for his recuperation as his girlfriend is expecting their first child shortly and De Koster is hopeful the player can make a return before the end of the season.

“He will have more tests over the next couple of days and then we should know more,” he said. “I’ve known Kevin since he was 15 and he has never had such a bad injury before. But we hope he can come back quickly to help City.”