Swindon loanee Liam Ridehalgh is wary of losing his first-team place when he is forced to sit out their FA Cup game against parent club Huddersfield.
The left-back, 20, has played six games since joining the Robins in September but will be ineligible on 12 November.
"The manager is going to put someone in and if they have a good game then he's got no reason to leave him out," he told BBC Wiltshire.
"That gives me a difficult situation because I'll have to sit out."
He added: "But I feel like I've been doing well. If I play well again on Saturday, and I'm allowed to play in the Johnstone's Paint Trophy as well, then I should be able to get back in the team.
"I know there's Cheebo [Alessandro Cibocchi] and Callum [Kennedy] who are very good left-backs and if I have a bad game then the manager will have no qualms about putting them in so I've got to play really well in every game."
League One promotion chasers Huddersfield sit 29 places above Swindon and Ridehalgh, who signed a loan extension at the County Ground last week, believes the Robins have been handed the toughest draw of the first round.
"It will be interesting to watch - to compare the two teams to each other," he added.
"I think Huddersfield are the best team in League One by far. Obviously, we didn't get promoted but I think we will [this season] with flying colours.
"It's the hardest draw we could have had with all the teams involved."