Kylian Mbappe would be a "stratospheric" signing for Real Madrid but a move is not financially feasible, according to the Spanish club's former president Ramon Calderon.

The Paris Saint-Germain forward has been strongly tipped to link up with Zinedine Zidane at the Santiago Bernabeu at some point in his career, potentially as early as this transfer window.

However, Mbappe still has two years to run on his PSG contract and would command a huge transfer fee, which Calderon feels no team can justify in the current climate.

"No doubt Mbappe is a player who everyone would like to sign. He has great potential, and he is very young," he told Stats Perform News.

"He reminds me a lot of Ronaldo, the Brazilian, because of his strength and his capacity to score goals. No doubt, he would be a great transfer.

"I don't know if Real Madrid are able to do it now. It would be a stratospheric transfer. He has a contract with PSG – they will not give him away for free.

"On the other hand, we are into a very expensive deal with the rebuilding of the new stadium. It is up to €1billion. So, it is difficult.

"But if the president thinks it can be possible, he will do it. However, I guess the economy will not be the best, especially at this time, when there will be financial issues at every club.

"The costs of transfers will totally change. They will go down, and also the salaries of the players will go down.

"So, it is basically an economic point. First, the player needs to ask for a transfer request and the financial agreement will come after.

"But, again, the financial agreement for Mbappe is not easy – it cannot be done by anyone."