Last season’s top goalscorer has found it difficult to hold down a place in the starting XI thanks to a combination of an early season injury and the signing of Joe Garner from Preston.
Reports in England had the striker moving to Bristol City in the January transfer window, due to a falling out with Warburton.
However, Warburton insists there is no problems between him and the player, who he brought to Rangers from Wigan Athletic during the summer of 2015.
He said: “Firstly I read a report that we had a big fall out, which was quite interesting, and Waggy knocked on the door and said: Have we fallen out gaffer? I said: Not as far as I’m aware Waggy.
“Last year we had literally run out of bodies by the cup final so we had to add to our numbers and we won’t go above 23, that’s fine for us.
“That means if everyone is fit and well then you’re going to have one or two frustrated players. The answer is work harder, just work harder and your hard work will be recognised and we’ll pick you.
“There’s no doubt about Waggy’s attitude, he’s a first-class professional. He’s frustrated but he shows that by working harder out there [in training].