Palace had been open to selling Rak-Sakyi, the deal move is a straight loan, without the option to buy.
However, sources have suggested that Stoke have not ruled out a permanent move in the summer and will revist the possibility dependent on the success of the half season move.
Stoke are five points below the play-off spots in the Championship and could make a promotion push in the second half of the season.
Full story to follow.