Montgomerie moved to Sussex after he was released by Northamptonshire in 1998 and proved to be a shrewd signing as he piled on the runs, including his first century for Sussex against his former club at Hove.
He had a dream year in 2001, when he was second to 1,000 first-class runs in the season and in 2002 he fell four runs short of a double century, his highest first class score to date.
His partnership of 176 with Murray Goodwin against Essex in 2001 was a Sussex record for an opening stand in the one-day league.
One of the few players to play all Sussex's first class games in 2005, he made a significanty contribution with an innings of 184 not out and saw Sussex come third in the County Championship.
Despite playing only half of Sussex's totesport league matches, he still managed to score 375 runs, including a fast 132 not out, and came second in the county's batting averages for the competition which saw them take the title and get promoted.
Although batting is clearly his strongest suit, he can bowl off-breaks and was Sussex’s fielder of the year in 2003.
Awarded a benefit for 2007 for 16 years' service to first-class cricket, and announced his retirement at the end of the campaign.