Forrester has joined Scottish Championship outfit Rangers from England’s League One side Doncaster on a six-month loan deal.
“Harry knows he has to work his way into the team – there are no gimmes for anyone,” Warburton told Rangers’ official website. “But he knows how we work – he is a technically gifted player who knows he has to bring something different to the team – and I have no doubts he can do that.”
Warburton’s message to Forrester about fighting for his place in the Rangers team came after the Gers’ 6-0 hammering of Dumbarton away from home.
Kenny Miller scored a hat-trick, and Martyn Waghorn, Andy Halliday and James Tavernier bagged a goal each at the Cheaper Insurance Direct Stadium.
Over the course of the 90 minutes, Rangers had 75% of the possession, took 20 shots of which 13 were on target, and earned 11 corners.
The Gers are at the top of the Scottish Championship table at the moment with 47 points from 19 matches. Warburton’s side are three points clear of Hibernian, who are currently second in the standings.
Rangers will return to league action on Saturday 16 when they take on Livingston at Ibrox in Glasgow.