Bristol City boss Steve Cotterill has earned a fourth successive League One Manager of the Month nomination after guiding his side to the title.
The Robins secured the championship crown in emphatic fashion during April, earning 12 points from six unbeaten games.
Preston North End's Simon Grayson joins Cotterill on the shortlist as his team consolidated second place in the table thanks to a seven-game unbeaten run that yielded 15 points.
MK Dons manager Karl Robinson is also among the contenders after the Dons took 19 points from 21 on offer to keep alive their automatic promotion hopes.
Finally, Paul Cook of Chesterfield completes the quartet following a month that saw the Spireites claim the final playoff spot with three wins.
The winner of the award is due to be announced on Friday.
