The 30-year-old Atletico Madrid midfielder was on loan at Stamford Bridge in the second half of the 2005-06 campaign, and previous to that had helped Jose Mourinho bring Champions League glory to Porto.
The player's contract runs out in June, and Maniche appears open to a move.
His agent Jorge Mendes told the Daily Star: "There have been a number of European clubs who have demanded information on Maniche, including the Premier League.
"It all now depends on whether they can negotiate with Atletico."
The club's sporting director Jesus Garcia Pitarch though says the Portuguese ace is not for sale.
He said: "He is an excellent player, so I am not surprised that there is so much interest.
"But there is nothing concrete and he can add great value to the team this season because it will be a long one."