Johnny Koutroumbis has signed a contract extension at Motherwell until summer 2028, with manager Jens Berthel Askou praising the Australian's "big impact on the team's development".
The 27-year-old full-back has recovered from an injury-ravaged first season at Fir Park to become a regular under Askou, making 29 appearances this term.
"He has adapted seamlessly to our new style in his natural position at right-back but has delivered equally impressive performances at left-back when needed there," Askou added.
"His strong defensive discipline combined with his relentless attacking runs with and without the ball are invaluable qualities in our team.
"Off the pitch his loyalty and social skills have proved vital when integrating new players from down under."
Koutroumbis says it was an "easy decision" to remain with the Steelmen.
"I'm so happy to stay at this club at a time when it's going in an exciting direction. Everything is in such a good place, and there is a lot of potential for us going forward," he said.