Dundee manager Jim Duffy was convinced that the opening goal in his side's 3-0 defeat at Ibrox should not have been allowed.
Duffy was adamant that referee Mike McCurry had blundered by penalising Jonay Hernandez for a penalty box challenge on Novo.
He said: "I have to say I thought the first goal was highly controversial.
"Nacho didn't complain that much and even the crowd were quiet when he went down in the box."