Portsmouth have signed Millwall midfielder Therry Racon and Stevenage striker Patrick Agyemang on loan and free agent John Akinde permanently.
Striker Akinde, 23, was released by Crawley at the end of last month.
Ghana international striker Agyemang joined Stevenage last summer, but has failed to score in 16 appearances this term.
Racon, 28, had made just one league appearance for Millwall this season, having begun his career at Charlton.
He also had a spell on loan at Brighton before signing for Millwall on a free transfer in June 2011.
"We think Therry is a gifted player and a really nice guy," Pompey caretaker manager Guy Whittingham told BBC Radio Solent.
"He has good ability on the ball and will drive us forward."