Chelsea are ready to send Ike Ugbo away on-loan this week.
Ugbo had a couple of spells away from Stamford Bridge and they want him to play first team football again.
McCall has space for one new loan capture and will have Ugbo on board ahead of facing Accrington on Saturday.
The Lewisham-born star joined Barnsley on a season-long loan deal at the start of last season.
But his contract was terminated in January after he scored just one goal in 15 appearances.
He joined MK Dons until the end of the campaign, where he found the net twice in 15 games.