By SABC Sport
17th July 2023
The 26-year-old moved to Elland Road from Bayern Munich at the start of last season and went on to make 36 appearances in all competitions for the Whites.
The former Spain Under-21 international, who started his career with Espanyol, becomes the fourth senior player to be sent out on loan following Leeds' relegation from the Premier League after Rasmus Kristensen, Brenden Aaronson and Robin Koch.
Forward duo Rodrigo and Tyler Roberts have also left the club on permament deals, joining Al-Rayyan and Birmingham respectively.
Leeds said of Roca on their website: "He now makes the move to LaLiga, with Betis, who finished sixth in Spain's top-flight last season.
"We wish Marc good luck during his time at the Benito Villamarin Stadium."