Watford midfielder Almen Abdi has suffered a dislocated shoulder, but the club are confident he does not face a lengthy absence.
The 26-year-old scored Watford's second in before being taken off on a stretcher.
It was the Switzerland international's fifth goal in 16 games since joining on loan from Udinese.
"We're confident the injury won't mean a lengthy absence," head of medical Marco Cesarini told the club website.
Former FC Zurich midfielder Abdi, who has played 51 times for Serie A side Udinese, will undergo a scan on Wednesday to inspect the full damage.
Meanwhile, defender Nyron Nosworthy is set to see a specialist about his ongoing rehabilitation on a hamstring injury.