The below-par pitch was used in the County Championship final against Essex.
Harmer played five Tests for South Africa before signing a Kolpak deal with Essex.
Kyle Abbott is the first player to take 17 wickets in a county match since 1939.
Ashwin joined Nottinghamshire for the English county season.
Ashwin’s Nottinghamshire stint will be his second in county cricket as the off-spinner has previously played for Worcestershire in 2017.
He will most probably play in their next game on Monday.
Both the team are clashing tomorrow at 3:30 PM IST in County Ground, Chelmsford.
He will join the team as Aiden Markram's replacement.
He returned to action post the 12-month ban in the BBL's recently concluded season.
Karunaratne was the best opener in Tests in 2018.