Four football fields had been driven over and the two that had sustained the most damage would not be back in use until after the weekend.
Thomas had been with the football club for 11 seasons and had never seen the grounds vandalised in this way before. He was notified of the incident about 2pm on Monday.
Tauranga City Council parks manager Mark Smith said thankfully the damage was not too significant and there was little that could be done at this time of year to fix damaged turf.
"We've asked all clubs across the city to cancel any training on their sportsfields for tonight and then review the weekend's activities depending on the weather.
"The clubs are all generally very proactive about looking after the turf through wet weather."
Police were not contacted about the incident.
Otumoetai Football Club training
Due to heavy rain and damage to the park, fields are closed for all training on June 5 and 6. Some pitches may be closed for repairs and coaches and players will be notified.