Keane has been in excellent form for the Under-21s since returning from his loan spell.
The 21-year-old moved to Old Trafford in January 2015 from Salford City.
Sunderland could be without two key players for end-of-season run in.
The club's executive vice-chairman also identified China as a 'useful market' if United need to sell players.
Arsene Wenger says that the former Manchester United forward is 'back to full power in training'.
Cope reported during the January transfer window that United were ready to launch a £15.7m bid.
Spanish international was already heavily linked with a move away in the summer transfer window.
Michael Carrick is not yet giving up hopes of winning the Premier League title with Manchester United this season.
Follow news and reaction as United executive vice-chairman takes questions from the club's investors.
Valencia coach has urged fans to create 'electric atmosphere' at Mestalla for crucial league clash.
The 38-year-old South African worked with the outspoken boss during their time at Porto.
Jose Mourinho is reportedly convinced he will replace Louis van Gaal at Manchester United in the summer.
Newcastle's Ayoze Perez had earlier admitted that he is flattered with Manchester United links.
Nicolas Gaitan has made 11 assists and scored five goals in all competitions thus far.
Jack Wilshere and Danny Welbeck have not played for England for eight and eleven months respectively.
Martial, like Evra, left Monaco to join United.
The former Barcelona keeper will become a free agent at the end of the season unless United renew his deal.
Varela has been given opportunities in the first team over the last three months.
Retired defender has called on his former club to make a firm decision on their managerial policy.
The 26-year-old defender says Marcos Rojo and Sergio Romero are the toughest Red Devils squad members.
The two Manchester clubs are also reportedly interested in his signing, but he has a £61.9m release clause at Atletico.
The 23-year-old keeper has filled the gap left by the departure of Thibaut Courtois to Chelsea.