Worcester Warriors director of rugby Dean Ryan has warned Scotland international Euan Murray that he must fight for a starting spot at Sixways.
Murray missed the Warriors' 32-15 defeat at Aviva Premiership champions Leicester Tigers because he doesn't play on Sundays due to his religious beliefs.
Ryan respects Murray's decision but says it hands opportunities to John Andress, his main rival for the tighthead position.
Ryan told Worcester News: "Euan is not first choice. He could come in this weekend because he's the equal of John. However, he will be first choice somewhere in the second-half of the season if I say he is.
"That's when selections are made. Euan has a bigger CV than John, but John has started pretty well. He gave away some silly penalties and he's aware of that, but in the scrum he's done pretty well.
"I'm not going to allow Euan's CV to say that he is number one choice - what I will do is to create opportunities for Euan, like I did in playing him for the Cavaliers at Gloucester on Monday - and we'll see over the season which one comes through.
"I don't want Euan thinking he's first choice, I need him or John to prove to me they are first choice."
Meanwhile, Worcester fly-half Ignacio Mieres says he has moved on from Sunday's 'biting' incident with Dan Cole.
Mieres suffered a cut finger but the RFU cleared Cole of foul play, saying they believed it was accidental.
"I don't really want to talk a lot about it; the matter is closed," said Mieres.
"They have said they are not going to cite him and I spoke with Dan after the game, so that is the end of the chapter.
"I know him from a long time ago when I was at Leicester. We talked and it was fine."