O'Brien is on-loan at Middlesbough this season.
"I don't have a clue, I'll have to see what happens in the summer," he said.
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"I've really enjoyed my time here and the time I've been playing. If it's the right time and the right things fall in place, I'd obviously love to come back here."
O'Brien has made 13 starts on the trot for Boro.