He plays primarily as a Forward. His current market value is estimated at 10K €.

His most recent move was a Loan from Gimnasia Y Esgrima to Estudiantes Rio Cuarto on 2025-09-30.

In the ARG Primera Nacional 2024 season, Alejo Mainero scored 0 goals and provided 0 assists across 6 appearances, averaging 0 goals per game with 0 shots attempted and 0 on target.