The 25-year-old has endured a mixed start since joining the Scottish Championship side.
The 25-year-old joined the Scottish Championship side during the January transfer window, but has failed to make a huge impression since his move, scoring just three goals from 12 league appearances for the Light Blues.
And after a disappointing performance during the Gers' defeat to Livingston on Tuesday, the former St Johnstone forward suggested that he is still adapting to the style of play that Warburton wants to see.
"I'm still learning how all the positions work here. It's a relatively new formation for me which I am just getting used to," he told the club's official website.
Having come from St Johnstone, who look set to finish around mid-table in the top flight this season, O'Halloran is perhaps not used to the pressure that is on Rangers in every league game they play.
Warburton's men are expected to seize the initiative in every fixture, dictate the tempo and attack with plenty of intent, which may confuse the striker somewhat seeing everyone move out of position - including the club's full-backs who are often seen in advanced roles - to ask as many questions of the opposition as possible.
But with his first pre-season as a Rangers players just around the corner, the time spent on the training ground should allow him the time needed to fully understand how the boss wants him to play.