But boss Nigel Clough expects the 23-year-old to go out on loan, with League One side Leeds still interested in the former Stockport forward.
Dickinson played the first half of a behind-closed-doors game against Peterborough at the Rams' Moor Farm training ground on Wednesday.
Dickinson, who has already had loan spells at Huddersfield and Blackpool this season, was set to join Leeds on loan at the end of January but the transfer did not go through in time.
An ankle injury then further postponed his protracted move to Elland Road.
"The run-out was to prove his fitness. He will now train for the next couple of days because he has not joined in training yet," said Clough. "Given all the strikers we have at the club, we are still expecting him to go out on loan."