Cristiano Ronaldo is understood to be all set to join Juve once the two clubs have reached a settlement.
Juventus made an £88m (€100m) bid for the 33-year-old at the start of the week.
The player had a ‘gentlemen’s agreement’ with Real that they would accept a bid at that price so long as it wasn’t from one of the Bernabeu club’s direct rivals.
However, Italian newspaper Gazzetta dello Sport claim Rea are now trying to renege on the agreement.
According to the report, Real reckon the agreement has expired on June 15 – the day he played in Portugal’s first game of the World Cup – and they are entitled to demand more cash for their prized asset.
Real Madrid want to sell Cristiano Ronaldo for £115m
Cristiano Ronaldo had a gentlemen’s agreement that he could leave Real for £88m this summer
Gazzetta dello Sport dedicated Friday’s front page to Cristiano Ronaldo
The Spanish giants are now calling on Juve to pay between £106m (€120m) and £115m (€130m).
Juventus have already had to work feverishly to balance the books on a move for Cristiano Ronaldo.
Their £88m outlay and subsequent £106m spend in wages will partially be backed up by FIAT, who are primed to sponsor the player.
However, Real slapping an additional £18m-£27m on the deal may prove too much for the Italian champions.
Gazzetta dello Sport claim Florentino Perez is trying to raise the transfer fee but Juve may not be convinced by his posturing.
The player himself seems keen to join the Turin club and is set to look at property in the Italian city this weekend.
His agent Jorge Mendes is standing by the gentlemen’s agreement, even though it is not legally binding.
There are suggestions Juve could unveil Ronaldo as early as this Saturday, although in all likelihood this transfer saga will drag on into next week.
Cristiano Ronaldo wanted to join Juventus from Real Madrid