Crook was born and bred in Australia but has English parents and is an all-rounder who bats in the top order and bowls off-spin.
A member of the Australian Cricket Academy in 1998, Andrew, the brother of team-mate Steven, had been playing as a professional at Great Harwood but was called up into Lancashire's senior squad for the Frizzell County Championship match against Worcestershire at New Road.
He made useful contributions of 27 and 24 and was also selected for the final match of the season against Gloucestershire, although he could not prevent the Red Rose county dropping down to Division Two.
He hit the headlines in 2005 when he smashed the highest score by a Lancashire batsman in the history of the Cheltenham & Gloucester Trophy.
He hammered an unbeaten 162 off 155 balls, including 14 fours and four sixes, in the first-round win against Buckinghamshire.
He made one championship appearance in 2005, scoring 43 against Essex, and was a regular in the one-day and Twenty20 sides.
However, he was released by Lancashire midway through the 2006 campaign and signed for Northamptonshire on a one-year contract.
He played in four of Northants' LV County Championship matches in 2007, scoring 269 runs at an average of 38.42.