The 23-year-old has joined Bradford on loan until the end of the season where he will try and help the Bantams book their League One play-off place.
Big things were expected of Thorpe in a Millers shirt this season following a summer move from Manchester United after a particularly impressive pre-season.
But after a harrowing debut in central defence in the 4-1 season-opener against MK Dons, he struggled for minutes under Steve Evans before coming back into the reckoning - as a central midfielder under Neil Redfearn.
There were moments of promise, particularly his display in the 1-1 draw with Reading, but he was a casualty of a shocking first-half performance against Ipswich and was taken off at half-time with Redfearn's men trailing 3-0.
He has failed to appear since then and heads to Valley Parade for the rest of the season having made seven appearances and scored two goals for the Millers.
He joins a Bantams side chasing a return to the Championship, where they are currently out of the top six on goal difference.
And Thorpe is happy to be going into a club that has something to play for, with the chance to make his debut in a vital clash with fifth-placed Millwall on Saturday.
"The club
obviously has a lot to play for at this stage of the season and I want to help
where I can," he told Bradford's official website.
"I can play in a
couple of areas and I am happy to slot in different positions to help out the
team.
"Every game
between now and the end of the season is going to be difficult - nearly every
team has a lot to play for - so I'm ready to give it my all."
Thorpe becomes the second Millers player to join their West Yorkshire rivals on loan this season following Jordan Bowery's short stay at Valley Parade before Christmas.
