Watford players Andre Gray, Nathaniel Chalobah and Domingos Quina were left out of the squad for the team's Premier League game against Southampton on Sunday.
A post on the club’s Twitter account said all three players were omitted by manager Nigel Pearson “to ensure the health and safety of all players, staff and officials at today’s game”.
A newspaper report claimed striker Gray had hosted a party at his house for around 20 people on Friday.
Meanwhile, striker Danny Ings kept the pressure on in the race to be Premier League top scorer, netting twice as Southampton won 3-1 at struggling Watford on Sunday.
Ings struck in each half to reach 18 goals and move one behind top scorer Jamie Vardy, who is enduring a drought after streaking clear for Leicester earlier this season.
Southampton moved up one place to 13th and well clear of the relegation zone, while 16th-place Watford remains one point above the drop zone with six games left.
The fleet-footed Ings is enjoying the best season of his career and got his first goal in the 16th minute. He collected a pass from William Smallbone some 30 meters out, advanced past two players and curled a shot into the bottom right corner from just outside the penalty area.
