This comes after the club had an offer for Luis Diaz rejected by Liverpool, and they are now in talks with Ivan Perisic, whose contract with PSV is expiring.
Deco believes that the team has a good balance between defense and midfield, with many players still showing potential for growth.
He mentioned players like Gavi, who is recovering from an injury and is expected to improve with next year's preseason training.
Additionally, Deco highlighted the progress of Marc Bernal, who was injured early in the season, and the team's efforts to prevent injuries to players like Ronald Araujo and Dani Olmo.
However, Deco noted that the team's attacking lineup is the only area where they feel a player might be missing, and they are looking to address this in the transfer market.