Swansea defender Kyle Naughton will serve a three-match suspension after accepting a Football Association charge of violent conduct.
Naughton was charged after the match officials did not see an incident which occurred during Swansea's 2-1 victory at Vicarage Road on Saturday.
Television pictures showed Naughton apparently stamping on Watford striker Stefano Okaka and the Swans have decided not to appeal against the decision.
The 29-year-old full-back will miss Premier League games against his former club Tottenham and Newcastle, as well as Swansea's FA Cup third round trip to Wolves next Saturday.
Saturday's match was Swansea's first under the charge of new manager Carlos Carvalhal and goals from Jordan Ayew and Luciano Narsingh secured a late comeback victory.
The win lifted the Swans off the bottom of the Premier League table, heading into their match against Tottenham on January 2, live on Sky Sports.