A defensive midfielder, he made his debut for
Herediano and played for
Puntarenas. In January 2010 he left Herediano for
Santos de Guápiles After playing for Santos de Guápiles, Vallejos decided to cease playing professional soccer in his country. He did however have a spell at second division
Guanacasteca and played abroad for Guatemalan second division outfit
Ayutla. In summer 2014, Vallejos rejoined relegated
Puntarenas in their bid to regain promotion to the Primera División. ==International career==