The playing future of former Spain captain Sergio Ramos is being questioned in France.

Ramos has only managed to make five appearances for Paris Saint-Germain since switching from Real Madrid last year, completing 90 minutes just twice.

The centre-back, who turns 36 next month, is currently recovering from a calf injury and is expected to miss the Champions League last-16 first leg clash against his old club Real on February 15, while he will also struggle to make the second leg at the Santiago Bernabeu.

There are genuine fears that Ramos will be forced to hang up his boots far earlier than planned due to his constant injury problems.

The report says the problem the Spaniard is currently recovering from is very similar to the one he sustained at the end of last season, which ruled him out for Real Madrid's title run-in and Champions League semi-final defeat to Chelsea and led Luis Enrique to leave him out of Spain's squad for Euro 2020.

The only difference is that is in the right leg rather than the left, meaning both of his calf muscles have taken a serious beaten in the last year.

Jean-Marcel Ferret, a former doctor with the France national team, described Ramos' problem as "old calf syndrome".

"The injuries are very difficult because you can never predict how they will evolve," Ferret told Le Parisien.

"It's all about the configuration of the calf muscle. You have to consider how the muscle has aged given the blows Ramos has taken in has career while playing at the highest level for 19 seasons and how much that has weakened his calves."