Wasps director of rugby Dai Young felt that a straight red card for Nathan Hughes was 'a bit harsh' in the defeat to Northampton.
Hughes knee collided with the head of George North and there was real concern for the Wales winger as he required treatment.
"First of all I hope George is okay, Nathan has gone looking for him to make sure he is okay – he is not that type of person," said Young.
"When you slow anything down it looks worse than it actually is and when the crowd get on the referee's back – a young referee – there is only going to be one decision. We felt it was a bit harsh.
"That eight minutes before half-time killed us, and the last eight minutes made the scoreline look a lot worse. It was a little bit cruel we didn't come away with a bonus point.
"The officials work as a team, you have to have help from your touch judges. I am not saying for a minute we lost the game because of the referee, as Northampton played a lot of good stuff, I am just surprised a few things were given."
Northampton boss Jim Mallinder viewed things differently, describing Hughes' actions as "reckless".
"[George] is okay now; he is up and walking about in the dressing room. It is a knock to his head, which is not good," said Mallinder.
"We will look after him and make sure he comes back when he is right.
"It was a tremendous kick-off by Stephen Myler and a tremendous take by Samu Manoa.
"George North still had quite a lot to do and scored a good try in the corner. The opposition have got to then be very careful once the try is scored and it was reckless coming in with the knee. Some serious consequences happened because of it."