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This video can not be played Watch as Aberdeen's Jack Mac Kenzie is struck by object Aberdeen defender Jack Mac Kenzie was left bloodied after being struck by part of a seat - thrown by one of his own fans - amid a pitch invasion following his side's Scottish Premiership defeat at Dundee United. Unused subtitute Mac Kenzie was on the pitch while the United supporters invaded the playing surface after their side denied Aberdeen fourth place. And he was felled by the piece of plastic hurled from the upper deck of the Fair Play Stand, which housed a travelling support restricted in number after objects were aimed at United manager Jim Goodwin in the last meeting at Tannadice. Aberdeen manager Jimmy Thelin told BBC Scotland after the match Mac Kenzie is "ok but it's quite a bad injury. " "This is unacceptable and can't happen, " Thelin added. "We have to get all the facts of what actually happened. All we know is Jack got a really bad injury as a player doing his job. This cannot happen in this way. " Latest Aberdeen news, analysis & fan views Dundee Utd come from behind to snatch fourth from Aberdeen Police Scotland confirmed Mac Kenzie was treated at the scene and will require further medical assessment. They have also appealled for information and asked that anyone who witnessed the incident or has footage to contact them. Match Commander, Superintendent Ray Birnie, said: "This was a mindless act which has seriously injured the player, resulting in him needing medical treatment. "This type of behaviour will not be tolerated and I'd appeal to all fans to help us trace the person responsible. "If you were in the Fair Play Stand and witnessed what happened, please do the right thing and come forward. I'd also urge anyone who has mobile phone footage to review it and bring anything of importance to our attention. " Goodwin, who has experienced similar incidents in on previous occasions in which he managed United against former club Aberdeen, labelled the scenes "a disgrace". "I deliberately took myself off the pitch as quickly as I could because we've had previous with the Aberdeen supporters, " he said. "I'm really disappointed to hear young Jack has been hit by an object thrown by his own supporters. He's inside having stitches now, it's an absolute disgrace. "It's probably taken something as serious as this to happen for the authorities to finally step in and do something about it to identify these idiots who let down a really good club. " Neither club are willing to comment officially on the incident until they have gathered more information, but the SPFL critised the "moronic behaviour". "It's enormously disappointing and frustrating that one of the most exciting games in the season has been marred by such moronic behaviour, " a statement read. "We await the match delegate report but will work closely with both clubs and Police Scotland to help identify the perpetrator and fully expect that appropriately severe footballing and judicial sanctions will be imposed. " Jack Mac Kenzie is hit by a black seat apparently thrown from the area of Tannadice housing the Aberdeen fans He receives several minutes of treatment from paramedics Then he is wheeled from the pitch And Mac Kenzie was left with significant facial injuries 1 of 4 Crystal Palace lead Man City in FA Cup final as Marmoush misses penalty Piastri beats Verstappen to pole after Tsunoda crash Muller says farewell as Bayern win on final day Celebs welcome Alison Hammond for a sleepover Award-winning dark comedy-drama starring Phoebe Waller-Bridge Can Marie Antoinette survive her reign? A unique peek into Stacey Solomon and Joe Swash's life What is still to be decided as season reaches climax? League reconstruction - why, when & what might it look like? 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