After the game Blues boss Steve Bruce spoke of his intention to bring Devlin to St. Andrew's on a permanent basis and this extra month will allow the two club's more time to try and come to an agreement over a permanent transfer.
Bruce told the club's official website: "It's a chance to thrash out a permanent deal over the next three or four weeks.
"I have been delighted with Dev over the last month.
"He scored a cracking goal on Saturday, but that's typical of Dev to wait for the end of his loan spell to score a goal like that."
Devlin's new deal will take him up to, and including, the re-arranged home game with Crewe on April 10th.