Andy Murray’s competitive return has been delayed, raising fresh doubts about his participation at Wimbledon.

The former world No1 has not played since he was knocked out of the Wimbledon quarter-finals last July due to a hip injury.

Murray insists he remains hopeful of returning at this year’s tournament, but the Scot has now pulled out of his planned comeback event in s-Hertogenbosch, Holland, which starts on Monday.

Having only returned to the practice court over the last couple of days, Murray faces a race against time to be fit for Wimbledon on July 2.

“It is with regret that I won’t be ready to play in s-Hertogenbosch,” he said.

“I was excited to play there for the first time, but I am not quite ready to return. I am still aiming to play in the coming weeks, but I want to be 100 per cent when I do return.”

Murray underwent hip surgery in Australia in January after pulling out of the Australian Open.

The 31-year-old will make a decision on whether he will enter the Fever-Tree Championships at Queen’s Club, which begins on June 18, next week.