Jose Mourinho believes Marco Silva's Watford are a far better side than the one that gave Manchester United a bloody nose last season.
The Red Devils were condemned to their third defeat in a week in September 2016 as late goals from Juan Zuniga and Troy Deeney gave the Hornets a 3-1 win.
That period remains the lowest ebb of Mourinho's Old Trafford reign and the United boss is aware just how hard it will be to exact revenge on Tuesday evening.
Watford are eighth in the Premier League after their impressive 3-0 win at Newcastle, with manager Silva's fine work leading to admiring glances from rudderless Everton.