Welbeck was taken off on a stretcher in a leg brace after twisting his right ankle during the club’s 0-0 Europa League draw with Sporting Lisbon on Thursday.
He was still in hospital yesterday as messages of support flooded in from friends, team-mates and former colleagues. But fears are growing that Welbeck could be out for at least six months with a suspected break and possible ligament damage, throwing his Arsenal future into doubt.
The 27-year-old is in the final year of his contract and talks have yet to bear fruit over extending his time at the club.
Arsenal manager Unai Emery, who described it as a “big injury”, was non-committal when asked about Welbeck’s contract situation in the aftermath of Thursday’s game.
Arsenal have in the past handed new deals to injured players but that was largely on the advice of Arsene Wenger, who is no longer at the Emirates.
Welbeck needed oxygen while he received treatment on the pitch after an awkward fall and some of his team-mates looked deeply shaken as he was carried off with his head in his hands.
The former Manchester United striker has endured an injury-plagued career and missed 59 games for Arsenal between September 2015 and January 2017 with injuries.
Arsenal face Wolves on Sunday, with rising star Morgan Gibbs-White being told he does not need to leave the Midlands club to become a big-time player.
Gibbs-White, 18, earned rave reviews by sparking a fightback after coming on as a substitute against Tottenham last Saturday.
He looks certain to feature again against the Gunners with Nuno firmly believing his England Under-17 World Cup winner will not have to go out on loan to further his education.
Nuno said: “What better environment for him than to be here where he has grown up? It’s home. Growing up at a club is the best thing.
“He has proven to us already that he has talent and quality. He’s a hard worker and professional, a really good boy. That’s what is required to be a very good footballer.
“He dedicates himself 100 per cent. He grew up here – this is his house. This is his environment.”