Celestine Babayaro is fighting to salvage his Newcastle United career.
And Allardyce says the left-back - who has been dogged by niggling groin and hamstring problems - must now stay fit if he has any chance of earning a place in his side.
He said: "He's training and no longer injured.
"But having not played competitive action for such a long time, he's short of match fitness.
"This now is the last go at it for Celestine."
Babayaro was signed by Graeme Souness from Chelsea in January 2005, and he has another season left on his United contract after the current campaign.
Injuries have stopped him establishing himself under Souness and his successors, with the 29-year-old having made just 45 league starts for the club.