Barcelona sporting director Andoni Zubizarreta has implicitly said that the signing of Thomas Vermaelen may not be the last of the summer.

Vermaelen completed his move to Barca on Sunday by sealing the five-year deal at the Nou Camp following his departure from Arsenal for a fee that could rise up to 18.8 million euros in the future.

Along with the new Barca signees Luis Suarez, Ivan Rakitic, Claudio Bravo, Marc-Andre ter Stegen, and Jeremy Mathieu, Vermaelen joins the club and will be under the new coach Luis Enrique next season as they regain their reputation from a extremely disappointing campaign under Gerardo Martino.

Zubizarreta expressed his delight with the signing of Vermaelen and other players. The sporting director is proud of the talent Barca has at hand right now. Nonetheless, he also revealed that the club is still open to more additions if the right players become available for they will need all the power and skill they can get.

"With the addition of Thomas, we completed a defensive line of a very high level. There are options that we are working on for the exit of some players; as such we're not discarding that others could come in." He said.

"What I can say is that at midnight on August 31 we hope to have the best squad possible. Even though we are very happy with the players that we have, if there is a chance to improve it, we will try."

"Until the first or second (of September), when we talk about the market being closed, anything could happen."

According to reports, Barca's targets include Fiorentina's Colombia star Juan Cuadrado, though Zubizarreta refused to reveal their prospect.