Barcelona says it has reached an agreement to send midfielder Rafinha to Celta Vigo for one season.
The 20-year-old Brazilian has come up through Barcelona's youth ranks - known as La Macia - since he was 13.
Rafinha holds dual nationality and has played for Spain in the under-16, U17 and U19 levels. But last year he switched to Brazil, where he played in its under-20 team at the 2013 South American Youth Championship in Argentina.
The attacking midfielder made his debut with Barcelona's senior team in November 2011, substituting for Cesc Fabregas.
Rafinha extended his contract with Barcelona until 2016 in June.