Harrison told the clubs official website: "I've signed for another two years and I'm very pleased. My last game was the defeat at Wembley so I'm determined to get out of this league next season. Rotherham have had a lot
of ups and downs since I've been here but it feels like it might all come together for us next season.
"The manager was very complimentary and said I'd done well for him this season," he added.
"He thought the team missed me when I missed games through suspension and that he wanted to keep me.I'm really pleased that what I've done this season has earned me another two years here.The gaffer didn't really play me at Tranmere so I felt I had a point to prove and I'm glad I've done that."
Meanwhile a number of midfielders have been linked with the club and at least one new face is set to be announced in the next 24 hours.
Defender Ryan Cresswell is hotly tipped to sign a contract with his home town club after turning down a new deal at Bury.