Micky Mellon believes his Fleetwood side felt the weight of Steve McNulty's injury early in Saturday's 2-2 draw at Cheltenham.
Skipper McNulty was forced off after 15 minutes at the Abbey Business Stadium, forcing a reshuffle to a defence already missing Dean Howell with an ankle problem.
Crucially, Mellon introduced Conor McLaughlin and opted against moving Junior Brown to left-back - leaving the winger to lay on David Ball's opening goal before firing an injury-time leveller for the Cod Army.
"It was difficult losing Steve McNulty," Mellon told the Blackpool Gazette. "We tried to minimise the impact because you don't want to mess around with your back four.
"We have a back four who are used to playing together with the goalkeeper. But we had to make that chance and Conor came on and showed us what a very talented player he is.
"He went across to left-back. We considered putting Junior (Brown) there but we just thought we'd lose that threat going forward and thankfully we didn't do that because he got us the first goal by getting the ball high up the pitch."