Saito was born in Kawasaki on April 4, 1990. He joined J1 League club Yokohama F. Marinos from their youth team in 2008. However he could not play many matches. In 2011, he moved to J2 League club Ehime FC on loan. He scored 14 goals in 36 matches in 2011. In 2012, he returned to Yokohama. He played many matches from 2012. Yokohama won the 2nd place in the 2013 J1 League. He was selected Best Eleven in 2016. In 2018, he moved to Kawasaki Frontale. Kawasaki won the J1 champions in 2018 and 2020. In 2021, he moved to Nagoya Grampus.