Ervine originally played for the short-lived CFX Academy team and then Midlands cricket team in Zimbabwe. He made his first-class cricket debut for CFX in the Logan Cup in March 2001.

After leaving Zimbabwe in 2005 he signed to play for Hampshire County Cricket Club in English county cricket and for Western Australia in Australian domestic cricket. Ervine declared that he would not return to play for the Zimbabwean national side and, following excellent form for Hampshire and Western Australia, Ervine announced that he would seek to qualify for either English or Australian international representation. His time in Australia was less successful and he was unable to hold down a place in the Western Australia team, although he became a regular in county cricket for Hampshire. Once he had committed to no longer playing for Zimbabwe he was able to play county cricket in England as a non-overseas player as he holds an Irish passport. He retired from professional cricket towards the end of the 2018 English cricket season. After finding his opportunities to play limited at Hampshire he had joined Derbyshire on loan but retired after just two matches with the team.

During the 2009 County Championship season, Ervine scored 832 runs at an average of 41.60, making him Hampshire's fourth highest run scorer in the competition. In the 2009 Friends Provident Trophy, Ervine scored his highest List-A score of 167 not out against Ireland. Ervine was later a member of Hampshire's winning squad in the final as they defeated Sussex by six wickets.

Later in his career Ervine returned to Zimbabwean domestic cricket with the Southern Rocks in 2010 before going on to play for Mountaineers and Matabeleland Tuskers. On debut for Southern Rocks he made scores of 208 and 160, his two highest innings in first-class cricket at the time. Later the same year he scored 237 not out against Somerset playing for Hampshire.

Ervine made his debut for Zimbabwe in October 2001 in a One Day International against England. He was a member of the 2003 World Cup squad and ever-present during the England tour later that year. He had begun to