The Rangers midfielder has become a bit part player recently for the in-form Ibrox side and has featured just once this year - in the 3-0 Scottish Cup win at Fraserburgh.

He recovered from a serious knee injury last season and played in the last Old Firm game at Parkhead in December, but is well down the pecking order since manager Graeme Murty received an influx of new blood in January.

He’s out of contract at the end of the season and his father Zlatko Kranjcar - the former Dinamo Zagreb and Croatia boss who has had 24 different management jobs in a career stretching 27 years - has revealed the 33-year-old former Spurs ace is struggling.

Niko Kranjcar's Rangers career has been blighted by injury. Picture: SNS Group

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He said: “After his major injury, he still gets a lot of pain in his knee. He still suffers from water in the knee.

“But he is still under contract with Rangers. You would have to ask him whether he will continue when his contract expires in the summer.

“He was out for almost nine months and when he played since coming back, he played well. But frankly, it is more and more difficult for him.

Kranjcar in action for Rangers in the Scottish Cup win over Fraserburgh last month. Picture: SNS Group

“When you get an injury like that, it’s not just physical, it can be the psychological side of it too.

“I retired at 35. I had an Achilles tendon injury, but I came back and I had less of a break than him. But at that stage, I already had no desire to keep playing.

“I think he is going to keep trying and at least he’s only 33. I want him to continue his career, but it’s his decision.”

Rangers' Niko Kranjcar to make decision on future during the summer