The attacking-minded midfielder moved to Ibrox during the January transfer window.
Harry Forrester's former teammate Garry Hay believes that Rangers' style of play is the reason that the switch to Ibrox has turned out to be the perfect decision for the attacking midfielder, The Scottish Sun reports.
The 25-year-old joined the Scottish Championship leaders during the January transfer window and has made a promising start to life with the Light Blues. And Hay - who played alongside Forrester when the former Aston Villa youngster went on loan to Kilmarnock in 2010 - explained why he is unsurprised that he is succeeding as part of Mark Warburton's side.
"Harry is a gifted attacking player who doesn't really suit playing in a system that forces him to defend all the time," he told The Scottish Sun.
"He did well for us at Killie but the Rangers formation and style of play suits him down to the ground.
"It's a 4-3-3 and Harry is playing as one of the front three. There isn't as much onus on him to defend and that is ideal for him.
"Mark Warburton likes his forward players to express themselves and be creative and Harry is perfect for that role.
"I've seen a few of his games since he came up from Doncaster and he is looking the part and scoring goals. I'm not surprised Rangers are going to give him a long-term deal because he has a lot to offer."
After an average spell to kick off his career with the Gers, Forrester has seemingly found his best form at the perfect time for the club.
He has four goals in his last six games in all competitions which has been especially important to Warburton's men as all of his strikes have come since top goalscorer Martyn Waghorn sustained an injury in February, so his contribution has helped make up for the loss of their biggest threat in front of goal.
And that form has helped keep Rangers well on their way to securing the title and promotion to the Scottish Premiership, and it was his goal after just 13 seconds that gave the club a perfect start in their Scottish Cup quarter-final clash with Dundee, which they would ultimately win 4-0 and book a place in the last four where they will come up against Celtic.