Regan has completed his three-match suspension following his red card in the 3-0 defeat to Leyton Orient and is in contention to return to a defence that leaked six goals at the weekend.
Trollope has no new injury or suspension worries and is likely to make changes following a 6-2 defeat to Sheffield Wednesday on Saturday.
Midfielders Charlie Reece and Ben Swallow may be promoted from the bench if Trollope decides to inject some younger blood into his side.
Will Hoskins is likely to keep his place up front after scoring two goals at Hillsborough.
Source: PA
Source: PA