Manchester United have been linked with a move for Virgil van Dijk this summer

Manchester United are planning on signing a central defender this summer and the three options they are pursuing are Michael Keane, Virgil van Dijk and Victor Lindelof, according to Sky sources.

Jose Mourinho said on Wednesday that he had given United executive vice-chairman Ed Woodward a list of players he wanted to sign and we understand Keane, Van Dijk and Lindelof are the centre backs on the list.

United are expected to sign one of the defenders before next season starts in August.

They sold Keane to Burnley two-and-a-half years ago for £2m. Since then, he has made his full England debut - against Germany in March - and played 90 times for Burnley. He has one year left on his contract at Turf Moor.

Michael Keane joined Burnley from United

Southampton's Van Dijk is expected to be the most in-demand centre back in the summer window.

We understand Southampton would not let him leave for less than £50m and he is also a reported target for Liverpool, Chelsea and Manchester City.

Benfica defender Victor Lindelof is also on United's centre back target list

Lindelof is the other name on United's centre back target list.

United came close to signing him from Benfica in January and the 22-year-old Swedish defender is valued at £40m.