He currently plays for Atromitos Athens, wearing the number 12 shirt. He plays primarily as a Midfield. His current market value is estimated at 350K €.

His most recent move was a Loan from Diagoras Rodou to Atromitos Athens on 2024-06-30.

Across 23 appearances in the Super League Greek 2025-2026, Mattheos Mountes registered 0 goals and 0 assists, while completing 9 key passes out of 638 total passes with a passing accuracy of 22.4.