The 20-year-old made his first-team debut in April 2011 but most of his appearances have been off the bench after being kept out the team by skipper Keith Lasley and both Steve Jennings and Nicky Law.
But with Law having followed Jennings out of the Fir Park exit door in the summer, Carswell has taken his chance despite new competition in the form of Paul Lawson and Iain Vigurs, who are vying to face former club Ross County on Saturday.
Carswell has started the last five games, of which Motherwell have won four and drawn one.
"It's always a bonus when you play and win, but it's up to myself to keep playing well and try to make that place in the team mine," Carswell said.
"Last season with Nicky Law and Keith Lasley in the middle of the park, they were different class.
"But this season, I don't know if we have got a starting XI yet. You saw that last week with James McFadden on the bench.
"It's up to whoever is playing to try to make that place theirs.
"The more games you play, the more confident you become. It's in training as well, you have to show the gaffer and Kenny Black that you're ready for a game.
"All the experienced players like (Stevie) Hammell and Las help. The standard of their training is different class.
"Even they know you have got to keep the standard going to keep your place in the team.
"They push your training on as well, if you need a wee kick up the backside, they will tell you."
Motherwell's form has pushed them into fourth place in the Scottish Premiership and a League Cup quarter-final against Aberdeen.
"Hopefully we can kick on and show people that were maybe doubting us at the start of the season that we will be up there challenging," Carswell said.
"We have done it the last two seasons and I don't see why we can't do it this year. And the League Cup is anybody's this year.
"There is a lot of exciting ties in the draw and I think everybody that goes through will fancy their chances.
"Aberdeen have put us out the last few cups so it would be nice to get our own back."
- Sports & Recreation
- Keith Lasley
- Nicky Law
- Steve Jennings