Warriors slumped to a 23-7 defeat last weekend in a sloppy and disjointed display at Murrayfield. Rennie has displayed a ruthless selection streak in the past - Ryan Wilson was left out altogether on Saturday - and Gibbins conceded players could not complain if they paid for what was a mistake-strewn performance.
"I wouldn't be surprised if there were a few changes next week. Rens picks his team on form," said Gibbins in The Scotsman. "If you get a shot to perform, then you better make sure you go and perform. If not, then you're probably out like poor old Wils was."
Gibbins revealed that Adam Hastings was down in the dressing room after his two intercepted passes led to the decisive try double for Duhan van der Merwe. "He'll be alright, he's a man. He's a grown-up - he'll look at his game and know where he went wrong," said Gibbins. "We'll help him along. I've got to look at my game, too. If someone wants to give me feedback, then I've got to look at that and take it onboard.
"Everyone was chatting to him in the changing room afterwards. He was disappointed, but we've all had games in the past where we didn't play as well as we wanted to. That's not just Adam - it applies across the board. A lot of the guys - myself included - didn't play to our capabilities. If you can't deal with the lows, then you shouldn't be there to deal with the highs. So Adam will be alright."
Gibbons was sin-binnedfor deliberate offside in the second half but was more disappointed in himself than Scots ref Mike Adamson. "I was disappointed. When you're running around that area (at the breakdown) and you run into some guy, it's probably going to turn out the way it did," said Gibbins. "I was disappointed with where I was (on the field)."
Gibbons went on to say there would be no problem in lifting the squad for what is now a must-win at Scotstoun on Saturday afternoon if they are to stop Edinburgh retaining the 1872 Cup. "No, I don't think so. You've always got to be up for every game you play in," he said. "Especially after a loss like that, I don't think it'll take much to get the boys up for the next game. "We'll talk about the areas we need to improve and it's probably going to come down to us big boys up front. We need more dominance in that area and to sort out our set-piece. We'll take a hard look at it and move on."