SID Nelson came on as a late substitute to help Tranmere see out a 1-0 win at Exeter on Saturday.
Nelson was sent on in the 93rd minute as James Norwood's goal was enough to help Tranmere into the League Two play-off places.
Tranmere withstood pressure in seven minutes of injury-time when Nelson's presence gave them extra defensive security.
Danny McNamara was on the bench as Dover moved four points clear of the National League relegation zone with a 3-0 win at home to Braintree.
Former Millwall striker Alfie Pavey got Dover's first goal.
Defender James Brown wasn't involved as leaders of League Two, Lincoln, won 2-1 at Forest Green Rovers.