Real Madrid legend Iker Casillas has aimed a sly dig at Manchester United manager Jose Mourinho, claiming the Portuguese is past his best.

As reported by Daily Mail, the sparring contest between Jose Mourinho and Iker Casillas has continued following the Spanish legend’s latest jibe towards his former manager at Real Madrid. The 37-year-old has claimed that the Manchester United boss is past his best and can no longer manage a big club.

The tensions between Iker Casillas and Jose Mourinho have been simmering since the latter’s reign as the Real Madrid manager. During his three-year stint at the Bernabeu, the Portuguese ended up relegating the then-club captain to the bench, which did not go down well with the Spaniard.

Those tensions have continued to this day, with the Manchester United manager suggesting that Casillas is at the end of his career. The latest development in this sparring contest has seen Mourinho being at the wrong end of a sly dig, with the Real Madrid legend claiming that the Portuguese is past his best.

Casillas and Mourinho have had their differences in the past. (Photo by Kevork Djansezian/Getty Images)

Casillas and Mourinho have had their differences in the past. (Photo by Kevork Djansezian/Getty Images)

“According to a Portuguese newspaper, someone said that a player like me (37 years old) is at the end of his career. Completely agree!” Casillas started on Twitter before continuing, “My question is, for that newspaper: In the case of coaches, when and at what moment do you see that they are no longer there to lead a team or train?”

Mourinho has endured a mixed bag of a reign at Manchester United, winning a couple of major honours while also delivering the club’s best finish to a Premier League season since Sir Alex Ferguson retired. But, the current campaign has been a dismal one, with the Premier League heavyweights sixth on the table.

The latest setback came in the form of a 3-1 defeat at the hands of bitter rivals Liverpool. The pressure is now growing on the former Real Madrid manager to improve Manchester United’s standing in the league, or risk being sacked.

Manchester United are reportedly considering replacement options for Mourinho already, and another big defeat could bring the manager closer to facing the axe. As far as the jibe by Casillas is concerned, we might not have seen the last of the feud, and it would not be a surprise for the Portuguese to hit back at the Real Madrid legend soon enough.

Mourinho though, will be more interested in keeping his job secure and helping Manchester United reach a stable base at long last, with a big scalp in PSG possibly looming in the UEFA Champions League as well.