The former Juventus ace has allegedly refused an offer from the Super Lig outfit as he seeks a move to the Spanish side
Marca.com claims Galatasaray had made the former Juventus man a concrete offer, but it was refused.
The Turkish side see Diego as an ideal replacement for Arda Turan, who left for the Vicente Calderon.
And it seems the Brazilian could follow as he is eager to join the Spanish club following a less than perfect season in Germany.
Coach Gregorio Manzano feels Diego will compliment the prowess of Radamel Falcao up front following the Colombian's €40 million arrival from Porto.
However, the 26-year-old midfielder has been told he needs to slash the current €5m per annum wages he is on in the Bundesliga.
Meanwhile, Punto Radio of Spain claims the player's father and agent Djair Ribas is ready to travel to Madrid to close a deal.