He was a member of the South Africa under-19 squad for the 2016 Under-19 Cricket World Cup in Bangladesh.

[3] He left South Africa to sign for Surrey in March 2016, with the intention of qualifying to play for England.

[5] He made his first-class debut for Derbyshire in the 2017 County Championship on 2 June 2017, taking four wickets in the match against Nottinghamshire.

[6] On his second Championship appearance for Derbyshire, against Northamptonshire, McKerr finished with bowling figures of 5/87 and 5/54, becoming the youngest bowler to take ten wickets in a match for the county.

[8] He made his List A debut on 23 April 2019, for Surrey in the 2019 Royal London One-Day Cup.