Aberdeen defender Jack MacKenzie was left bloodied after being struck by what seemed to be 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 MacKenzie was on the pitch while the United supporters invaded the playing surface after their side denied Aberdeen fourth place.

And he was felled by a projectile hurled from the area of the ground that housed a travelling support restricted in number after objects were aimed at United manager Jim Goodwin in the last meeting at Tannadice.

Speaking to BBC Scotland after his side sealed a European place on Saturday, Goodwin labelled the incident “a disgrace”.

“I deliberately took myself off the pitch as quickly as I could because we’ve had previous with the Aberdeen supporters in the past,” the former Pittodrie boss 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.”