Lomas is keen to retain the services of the 21-year-old midfielder, even though his time at McDiarmid Park has been hampered by injury.
The Northern Irishman, preparing for the visit of Tayside neighbours Dundee on Wednesday, told Press Association Sport: "Peter's loan deal has run out. We want to keep him here but that is down to Aberdeen."
He added: "We would like to get a decision by today, one way or the other, so we know where we are at."
- Sports & Recreation