Manchester United are willing to let striker Will Keane leave Old Trafford in the summer transfer window, with Sunderland interested in signing the 23-year-old. New Black Cats boss David Moyes has authorised a £6.5m ($8.5m) bid for the forward, who reportedly wants to leave United in search of regular first-team football.

Red Devils manager Jose Mourinho is understood to be happy with his striking options, which include Wayne Rooney, Zlatan Ibrahimovic, Anthony Martial and Marcus Rashford, and is in favour of Keane joining another club.

"Keane would cost about £6.5m but with potential add-ons in the future," a United source told Sun on Sunday.

"He has gone on the tour of the Far East but not really spoken to Jose yet about his role. He scored last week at Wigan."

Keane only made one league appearance for United last season after being recalled from a loan spell at Preston North End in December by former Red Devils boss Louis van Gaal.

He has played for England at the Under-21 level and has had loan spells at Wigan, Queens Park Rangers and Sheffield Wednesday.

Moyes unveiling

Moyes, 53, has signed a four-year deal at the Stadium of Light after Sam Allardyce left the club to become England manager.

He briefly worked with Keane during his ill-fated stint as United manager in the 2013/14 season.

Will Keane
Will Keane, 23, only made one Premier League appearance for Manchester United last seasonGetty Images

"I am delighted to have joined Sunderland. I am relishing the challenge and excited by the opportunity," the Scot told Sunderland's official website.

"I have taken over a big British club with a great support and I'm looking forward to working in the Premier League again.

"I look forward to continuing the good work done by Sam."

Moyes had been out of work since being sacked by Spanish club Real Sociedad last November.

Sunderland finished 17th in the Premier League last season, two points above relegated Newcastle.