Sky Sports News HQ understands Manchester United will reject any bid for defender Chris Smalling, who is reportedly interesting Arsenal.
The 25-year-old has made 22 Premier League appearances, including 18 starts, under United manager Louis van Gaal in the Dutchman's first season in charge.
Smalling has also been a regular in the England set-up under Roy Hodgson, but there has been speculation over his future with Arsenal thought to be leading the race to prise him from Old Trafford.
Despite securing a regular first-team place, it is understood United are keen on bringing in another defender in the summer.
However, it is understood that Smalling, who joined United from Fulham in 2010 for an undisclosed fee, is not for sale, especially to one of United's Premier League rivals.
Van Gaal, who has a reported £100m to spend at the end of the current season, bolstered his defence with Marcos Rojo and Luke Shaw upon his arrival.