DOB: 11 May 1989
From: Hurstbridge/Northern Knights, Selection #14, 2007 National Draft
Acquired with the pick that the Demons received for trading Travis Johnstone to Brisbane, Grimes came to the club as an under-18 All-Australian but was diagnosed with stress fractures in his back shortly after being drafted and forced onto the long term injury list.
Having altered his running technique and undergoing a series of exercises he managed to break into the senior side for the last game of the year. During the 2009 pre-season he suffered a back injury on the other side of his back, and it was originally suggested he might miss the entire year but he bounced back to play 11 games from Round 7.
A regular of growing status in 2010 Grimes played the first 14 games of the year before a hamstring injury in the round 14 loss to St Kilda ended his season prematurely. At the end of that year he signed a contract extension, despite having a year to run on his deal, to keep him at the club until the end of 2013.
Despite not having yet played a full season Grimes was elected to the Demons' leadership group for 2011 by his fellow players, but after playing the first six games of the season he suffered a broken navicular in his foot during the opening minutes of the Round 6 game against Adelaide and missed the rest of the season.
The injury prone Grimes was named co-captain for 2012 alongside Jack Trengove but suffered another setback when he hurt his shoulder in a training session. He returned for the start of the year and enjoyed his first ever injury free season, missing just one game through suspension, and was one of his side's best players in the second half of the season.
After his first injury free season Grimes started 2013 as one of his side's best in two diabolical performances. He then signed a contract extension to keep him at the club until the end of 2016, but suffered a broken collarbone in a tackle by former teammate Brock McLean during the Round 6 loss to Carlton and missed two months of football.
In 2016 he found it impossible to break into the side, even with great VFL form. After being named emergency several times he played two consecutive senior games in the middle of the game before being dropped again. He was delisted at the end of the year and returned to Hurstbridge.
Grimes' brother Dylan debuted for Richmond in the last game of the 2010 season, two years to the round after Jack made his debut against Richmond in round 22, 2008.
|Round 3, 2012||Rough Conduct||1 match|