Carlos Bacca has joined Villarreal from AC Milan on a season-long loan deal which includes an option to buy.

Bacca, who was presented to the media on Thursday (AEST), said he was optimistic ahead of the new LaLiga season, which starts this weekend.

"Hopefully we have a very good season," he said.

Club president Fernando Roig delighted in the signing and made it clear Bacca would be key to helping Villarreal this season.

"It's a great signing," Roig said. "He comes with great enthusiasm and desire. Hopefully it will be available for the start of the League."

Roig also made it clear he did not want Villarreal to be fighting against relegation this season.

"There are three teams that at the end of the League will descend, and we do not want to be one of them," he said.