James Milner was absent from Liverpool training on Tuesday afternoon.
The veteran midfielder was left out of the matchday squad against West Ham due to a slight muscle strain and is continuing to recover.
Captain Jordan Henderson and playmaker Xherdan Shaqiri were both also absent as they continue rehabilitation from respective injuries too.
A number of Academy players including Sepp van den Berg, Leighton Clarkson, Jake Cain and Luis Longstaff took part in training.
Liverpool travel to Vicarage Road on Saturday afternoon to face Watford.
The Reds are currently 22 points clear at the top of the Premier League table and have a chance to extend their lead to 25 points over Manchester City with a victory this weekend.
There are 11 games remaining of the 2019/20 season and Jurgen Klopp's side look set to claim the title for the first time in 30 years.
