Plymouth Argyle's training facility has suffered an estimated £5,000 worth of damage during a break in, Devon and Cornwall Police say.
The incident at Harpers Park, Outland Road, reportedly happened on Sunday evening.
A spokesperson for the championship club said: "Significant damage was caused to the recently-installed pitch irrigation system, site perimeter fencing and video analysis platform."
Managers added that a reward would be offered to anyone who could provide information that led to the identification and prosecution of the offenders.
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