Pique had earlier claimed on Twitter that "today will be a great day" and those sentiments were echoed by goalkeeper Victor Valdes, who announced the deal could be done "in a matter of hours".
Club captain Puyol also expressed his optimism on the social networking site, before Pique all but confirmed the deal as he tweeted: "We now have him here".
Puyol then showed his delight at the prospective move as he wrote: "Welcome home!!! Happy to have you here @cesc4official"