McDonald said: "One of the reasons we sent him to Birmingham was to try and get that consistent time on the field. He would have had a battle on to get into the team here.
"He has gone to Birmingham, got in the team and played well consistently which is great.
"I saw comments from Lee Clark that he might possibly want to take him on loan again next year to give him some more experience. That would be great and it is a decision that the manager has to make.
"Do we bring him back because he's had a good a year's football in him or do we leave him there for another year to see if he will develop even more? We'll decide that in the summer."