FC Twente manager Michel Jansen reportedly lost a tooth during his side's clash against champions Ajax in the Eredivisie.
Jansen's assistant coach Youri Mulder was celebrating Twente taking the lead in their match on Saturday when he accidentally caught the club's manager in the mouth.
"Youri celebrated rather excitedly," the Daily Mail quotes Jansen as saying.
Despite netting the opener, Twente eventually had to settle for a 1-1 draw.