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Quique Sanchez Flores has warned his Watford players not to take anything for granted when they travel to face an injury-hit Manchester United on Wednesday.
United are currently without a number of first-team regulars, including Wayne Rooney, Chris Smalling and Phil Jones but they go into Wednesday's game on the back of three positive results - they defeated Shrewsbury, FC Midtjylland and Arsenal in the space of seven days.
The lengthy injury list has resulted in Louis van Gaal including some of United's academy graduates with Marcus Rashford in particular impressing against FC Midtjylland and Arsenal.
Flores is wary of the younger players and admits Watford face a tough evening at Old Trafford.
"I don't like to say to the players, 'come on boys, now Manchester United are a little bit weak because they have injuries, because they are younger, because they don't have experience', no, it is the opposite," said Flores.
"I try to send other messages to the players, saying take care and don't relax. Yes, they are younger, but they have a lot of passion, and they want to show everyone they are ready to play in the Premier League.
"So, of course we will play a very tough match, and this is the idea we try to translate to the players. Maybe this is not the best XI they have in the squad, but they are playing really, really well."
Rashford was a late inclusion in the starting line-up against FC Midtjylland and scored a brace as United defeated the Danish side 5-1, before netting twice in the 3-2 win over Arsenal in the Premier League.
"He looks really good and I love younger players. I love how he moves to the space and how he moves inside the box," Flores said of the 18-year-old.
"He is a very good talent for the future of England and very good news for Manchester United.
"With the younger players when they knock on the door, as a coach you need to open the door and say 'okay you are ready to go' and this is what has happened.
"Manchester United have had a lot of injuries, a very difficult period for them, and this is the moment when the younger players use the opportunity to establish themselves in the team."