United's Belgian feeder side revealed last week that they had agreed to take Cofie and Keane on loan for the rest of the season.
And whilst young striker Cofie has made the move across the Channel, central defender Keane opted to stay in Manchester.
"It's a fantastic opportunity for him," reserve boss Warren Joyce stated.
"It's another country and a place where you look at the players who have been there - Jonny Evans, Fraizer Campbell, Darron Gibson, Danny Simpson, Lee Martin, Craig Cathcart, Sylvan Ebanks-Blake, John O'Shea, Ryan Shawcross - all players who have played in the Premier League.
"I know from first-hand knowledge that he'll get a lot of experiences over there that he can't get here."