Hannover admit to being in the market for a new midfielder but deny that Chelsea's Marko Marin is a target.
Iago Falque has departed Tottenham for Serie A side Genoa for a fee reported to be around £4m – pending a medical.
The 29-year-old Brazilian joined the Rossoblu on a four-year deal in 2009 but after scoring just 15 league goals for the Sardinians it appeared he would move on in the summer.
However, a statement published on cagliaricalcio.net read: "Cagliari announce that the player Miguel Anderson Da Silva 'Nene' has renewed his contract with the Rossoblu for another year."
Nene's best individual contribution to the Cagliari cause came in December 2010 as he scored a hat-trick in a 3-0 home victory over Catania.