The Premier League giants are looking to seal a permanent transfer for the midfielder and are close to completing a deal.
The player is discussing a permanent transfer with the Championship outfit Preston.
Grimshaw impressed during his loan spell at Motherwell and Preston manager Simon Grayson is keen to secure his services permanently. The player made 16 appearances for the Scottish Premiership side after joining them on loan last September.
The Old Trafford outfit have recalled Grimshaw after Simon Grayson informed the Premier League club of Preston’s interest.