The Turkish giants are exploring the possibility of bringing the most marketable footballer on the planet to their club.
The 37-year-old is being linked with a move away from United, as he is no longer first choice under new boss Erik ten Hag.
Fotomac says Galatasaray are ready to put in a big offer to secure Ronaldo in January.
What works against Gala is that they cannot offer Ronaldo European football this season, as they finished 13th in their domestic league last term.
However, their form this time around is much better, as they sit in 4th spot in the Super Lig.