Betis president Manuel Ruiz de Lopera is keen to retain the Spain international but Real Madrid are favourites to land a player who has also attracted attention from Chelsea and Manchester United.
"We have very important offers for the sale of Joaquin," the Seville-based club's supremo told Radio Marca.
"One of them will be Barcelona.
"All the great clubs are always open for negotiations when you speak about a star and Joaquin is a very good player."
Chelsea tabled two massive bids in December for the wide man but were unable to thrash out a deal during the transfer window in January.
"I want an important effort to keep the player," added Lopera. "I am not interested in the exit of Joaquin because my club needs the aid of all the players."
Lopera believes Betis' qualification for next season's UEFA Champions League will be the decisive factor in keeping hold of the 23-year-old.
In a separate interview with local newspaper Diario de Sevilla, he hinted that the other three clubs chasing his star turn are indeed Real, Chelsea and United.
"Chelsea, Madrid, Manchester and other teams want Joaquin," he stated. "But now we can close the door."
