Watford boss Javi Gracia knows first-hand how destructive Mohamed Salah can be - even if the Liverpool forward has scored just once in his last five games.
Gracia's side return to Anfield on Wednesday night for the first time since Salah scored four times in a 5-0 thrashing last March.
Salah was substituted by Liverpool boss Jurgen Klopp during Sunday's goalless stalemate at Manchester United - a draw which saw the Reds return to the top of the Premier League table.
A fifth consecutive home league win over the Hornets will ensure Liverpool remain at the summit and, although Salah has scored just once in his last five games, Gracia knows his side will need to be at their best to get a result.