Reports claim the 30-year-old is ready to leave the Bernabeu next summer and United are ready to battle with PSG to land the highly-rated Portuguese forward.
The Daily Mirror reports that Ronaldo is ready to leave Real Madrid next summer after seven years at the club as he seeks a new challenge.
United are desperate to bring Ronaldo back to Old Trafford, but face competition from French giants Paris St Germain to sign him.
Real Madrid want around £90million for the forward, while Ronaldo’s advisors expect the fee to be closer to the £70million mark.
United are reportedly ready to hand Ronaldo a massive £15million-a-year deal, should the forward return to Old Trafford.