The Gers played out a 3-3 draw with Raith Rovers away from home at Stark's Park in the Scottish Championship on Saturday afternoon.
Winger Forrester, who joined Rangers in the January transfer window, scored the Glasgow giants’ opening goal of the match on the half-hour mark.
Miller was impressed with the hard work of the 25-year-old Englishman against Rovers and has praised him highly.
“It’s cliched, but we defend as a team and attack as a team,” the striker told Rangers’ official website. “We try hard up front, and you look at Harry Forrester and how hard he worked before he went off over in the far corner to stop them getting out – and that’s what we’re all about.”
Rangers would have won the game against Rovers had they not conceded the equaliser in the fourth minute of injury time.
Mark Warburton’s side will return to action on Tuesday evening when they take on Dumbarton at Ibrox in Glasgow in the Scottish Championship.
The Glasgow giants will clinch the league title and gain automatic promotion to the Scottish Premiership if they pick up all three points from the encounter.