Celtic coach Ronny Deila has suggested that Dundee United's Aidan Connolly dived following the sides' 1-1 draw in the quarter-finals of the Scottish Cup.
United took the lead in the game through Nadir Ciftci, who tucked in from the spot after Connolly went down in the box under pressure from Anthony Stokes, before the Hoops rescued a draw thanks to Leigh Griffiths.
"It is a dive and hopefully it will be the same rules for everybody," said Deila, according to the Daily Mail.
"We are the only team this season in the league to have a suspension for diving, Derk Boerrigter. I said at the time that it was no problem because that is the line that will be taken by everyone.
"I don't think anybody has had it since then. I accept that people make mistakes. But if we have a rule where people look at things afterwards then it has to be the other way around also."
Celtic currently hold first position in the Scottish Premiership, six points clear of second-placed Aberdeen.
