Hernandez scored 19 goals and recorded 14 assists in 27 regular season appearances for the club in 2024, leading them to a CONCACAF Champions Cup final and a Leagues Cup title. In addition, he led them to the No. 2 overall seed in the MLS postseason.
Betis, who roster U.S. international Johnny Cardoso, sit ninth in La Liga but have advanced to the Round of 16 in the UEFA Conference League -- with the next round in two weeks time.
Hernandez will compete for minutes with Congo international Cedric Bakambu.
Across his entire time in MLS, Hernandez scored 44 goals and recorded 28 assists in 70 regular season appearances for the Crew, adding eight goal contributions in eight career MLS Cup Playoff matches.