Defender Harriman, 20, will now stay with the Chairboys until the end of the season after the two clubs reached an agreement with parent club QPR.
Andrade, also borrowed from the Hoops, has signed on at Adams Park until the end of the campaign.
Striker Matt McClure should return having missed their last match against Dagenham due to the birth of his daughter.
Ainsworth has no fresh injury concerns but he will be without Gary Doherty once again as he recovers from back surgery.
Danny Foster also went under the knife and is ruled out while Leon Johnson still has a knee injury.