Watford, who are three points adrift at the bottom of the table, are looking for their first win.
Sheffield United are aiming to maintain their unbeaten start in away matches, having won at Everton in their last road trip.
Team news
Watford have close to a fully-fit squad with only Troy Deeney expected to miss out as he works his way back to full fitness following knee surgery.
Billy Sharp is in contention for Sheffield United having served out a three-match suspension. David McGoldrick (groin) continues to be monitored.
Did you know?
Watford have won four of their last five Premier League matches against promoted clubs.
Sheffield United are looking to secure back-to-back PL away wins for the fourth time, having done so once in each of their three previous campaigns in the competition. The last occasion in 2006/07 included a victory at Watford.
These teams last met in a league match in March 2011 in the Championship, with Watford winning 3-0 at Vicarage Road.
Sheffield United’s seven PL goals this season have all been scored by different players, including a joint-high two own goals in their favour.
Match officials
Referee: Andre Marriner. Assistants: Simon Long, Peter Kirkup. Fourth official: Tim Robinson. VAR: Martin Atkinson. Assistant VAR: Harry Lennard.
