Mats Hummels
Hummels celebrates after scoring against Portugal on Monday.GettyImages

Borussia Dortmund defender Mats Hummels is not thinking about a move to Manchester United this summer but admits a move to Old Trafford could appeal to him 'someday'.

In the wake of Louis van Gaal's appointment as United boss Germany international Hummels emerged as the club's top defensive target in a summer where the Dutch coach is expected to make sweeping changes to his squad.

After scoring a thumping first half header as Germany cruised to a 4-0 victory in their Group G opener against Portugal, Hummels refused to rule out the possibility of a move to United, although insisted it is unlikely to happen this summer.

"I never think about that or talk about it because it is something that isn't important for me right now," Hummels was quoted as saying by the Daily Telegraph when asked about United's interest.

"Maybe it will be some day, but I don't expect it to be like that this summer."

Following the departures of Rio Ferdinand and Nemanja Vidic, van Gaal is expected to add at least one centre half to his squad to supplement the trio of Jonny Evans, Phil Jones and Chris Smalling.

In recent days the club have been linked with a move for Arsenal skipper Thomas Vermaelen with reports suggesting the Belgian has already agreed a deal in principle to complete a move to Old Trafford this summer.

Vermaelen, 28, is close to entering the final year of his contract at the Emirates, suggesting he would be available for a fee in the region of £10m. However, the defender's agent Kees Vos has since denied his client is close to leaving the Gunners, telling the BBC on Monday: "There is no deal in place with Untied or any other club."