Speaking further, Emery said that Welbeck would have X-rays on his leg after appearing to break his ankle.
"The worst news tonight is these injuries, we think serious injury".
Arsenal have been linked with Pepe before but Welbeck's injury may force their hand, though the 23-year-old previously insisted he would not leave Lille in the middle of the season - though he did welcome interest from the Gunners.
"His injury is also [bad] for the mentality of the players because they looked and saw it is a big injury, but when you are playing football and competitive matches it can happen".
Meanwhile, defender Stephan Lichtsteiner is facing four weeks out after sustaining a hamstring injury against Sporting.
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Welbeck's contract is up at the end of the season and, asked whether he might consider offering Welbeck a new deal as motivation for his recovery, Emery was characteristically noncommittal.
"Danny remains in hospital and will continue to be assessed".
"A further update will be issued over the next 72 hours", said the club.
Significant right ankle injury.
Right hamstring. Being assessed ahead of Wolverhampton Wanderers (h) on Sunday, November 11. Now being integrated back into full training. "We are going to wait", Metro UK quoted Emery as saying.