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Barcelona president Joan Laporta told the football world to "get ready, we're back" as the Catalan giants presented new arrival Ferran Torres.
The Spanish international has joined from Manchester City in a deal that could be worth EUR55m ($A86m).
His signing came despite Barca's well-publicised financial problems, with debts rising above EUR1.2 billion ($A1.9b) last year.
Indeed, the club will be unable to register Torres until they offload some players as they would otherwise risk exceeding their salary cap, which is also the reason they have had to wait to add veteran Dani Alves to the squad.
Despite their financial constraints, club members voted last month to approve the EUR1.5b ($A2.4b) Espai Barca project that will see an overhaul of Camp Nou and other facilities.
Rumours persist Barca will sign Alvaro Morata on a loan deal in this transfer window while Barca have been linked with a move for Borussia Dortmund star striker Erling Haaland.
Laporta did little to discourage such talk telling reporters when the subject was raised: "If you'll allow me, I won't talk about particular names. It doesn't help at all. It increases their value.
"We're working to reinforce the positions the coaching team have asked us to... We have a squad under reconstruction, and we'll soon see the resurrection of the team.
"Ferran is the proof: that a top-quality player has shown a desire to come to Barca means the resurgence is a reality.
"Everyone should get ready. We're back."
Torres hasn't played since October because of a foot injury sustained on international duty with Spain, but was hopeful of being available for the Janary 12 match against Real Madrid in the Spanish Super Cup semi-finals.
However, shortly after his presentation Barcelona announced both Torres and Pedri had become the latest players to test positive for COVID-19.
The club said the players were in "good health" and isolating at home.