Grant said: "When I came to the club the squad was not balanced so we wanted to bring three or four more. The Premier League's embargo did not allow us to follow this programme so the only thing we could do was bring loan players who wanted to play in the Premier League but not under contract.
"Quincy is one of them and I know him from when he was at Arsenal and I followed him in Russian football.
"We know he is a player with a lot of quality. I like to develop players and get the best from them and he is a player who will be very good if we get all the potential from him."