Rob is ESPN FC's Manchester United correspondent.
As for Watford, the Hornets hammered Newcastle United 3-0 away from home at St. James' Park in the Premier League on Saturday afternoon. "Marcus [Rashford] and [Anthony] Martial, [are] without the tactical knowledge that another player has to close the spaces in between the full-back and winger so, even with Paul, we were a little bit in trouble".
Defender Miguel Britos is a doubt after suffering a knock in the 3-0 victory over Newcastle and will be given a late fitness test.
Man United made it seven wins from seven home matches as Ashley Young's fluky strike, deflected in off Brighton's Lewis Dunk gave them a 1-0 win at Old Trafford.
That status was hard to imagine back in September when Manchester City hit six at Vicarage Road without reply.
The Reds have named the same starting XI for our previous two domestic fixtures, the home wins over Newcastle United and Brighton, but a tricky game on the road against the impressive Hornets may prompt a change.
"And I knew in the last part of the game they would bring (Shane) Duffy up and play long balls so I thought (Marouane) Fellaini would be important but Paul was as well".
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Watford are 8th with 21 points through the first eight games of the season.
Despite taking charge of both Hull City and Watford since becoming a Premier League manager in January 2017, Marco Silva has only won four games fewer (12) than Manchester United boss Jose Mourinho (16) in this period.
An automatic choice between the sticks, the Spaniard will be looking to keep a second clean sheet in three days.
Romelu Lukaku could make his 200th Premier League appearance in this match - he now has 93 goals.
Tom Cleverley and Will Hughes will again look to provide the invention from central midfield, while Richarlison - who has five goals and three assists in the league this season - should be given a free role once again. Only 10 players have scored more goals than this in their opening 200 appearances in the competition, with Alan Shearer (145) leading the way.
Manchester United striker Zlatan Ibrahimovic is pushing for his first start since April.
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