Omer Riza says he was unhappy with the officiating during Cardiff City’s 1-0 defeat at Luton Town.
Jacob Brown netted the only goal of the contest at Kenilworth Road as the Bluebirds’ six-game unbeaten run came to an end.
But interim boss Riza was left unimpressed with referee Matt Donohue after the game in Bedfordshire.
“I wasn’t too happy with the officiating today if I’m being really honest,” he told BBC Radio Wales.
“I thought it was quite one sided. I felt a lot of stuff given to them was really similar to what wasn’t given to us.
“I just couldn’t quite understand it at times. I tried to ask the question at half-time and it was difficult.
“That was disappointing for me, to come to a place like this and not be given, as far as I’m concerned, things that should have been given that weren’t, which caused us even more of a problem.
“But well done to Luton, they managed to get a win against us today and the boys are disappointed which, for me, shows where we’ve come to at the moment.”
Luton were also left feeling aggrieved in the latter stages of the first-half after referee Donohue failed to award the home side a penalty after an apparent handball by Cardiff defender Calum Chambers.
“I’ve not had a chance to look back at it, it was handball and it hasn’t been given,” added Riza.
Defeat to the Hatters was only Cardiff’s second in eight outings under Riza.
The Bluebirds fall to 21st in the table, sitting above the Championship’s bottom three on goal difference.