KARL Robinson has revealed more details about Yanic Wildschut’s ‘severe’ hamstring issue.

The winger suffered the injury just 15 minutes after coming on as a substitute in last Saturday’s pre-season friendly at AFC Wimbledon, his first Oxford United appearance.

Wildschut’s arrival from CSKA Sofia was only confirmed 24 hours earlier but he will miss the early part of the new campaign.

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Robinson revealed the 30-year-old had surgery last week and explained how the ‘freak’ injury came about.

The U’s head coach said: “It’s a severe hamstring (issue), grade four. It’s a tendon issue so it’s a serious one.

“When you see the video back, in full extension someone’s leant and then that force has made it a lot more severe. It’s a freak.

“If any footballer finds himself in that extension of the hamstring with force then you’re always suspect to an injury. It’s not great news.”

Wildschut was one of two U’s players to miss Saturday’s Sky Bet League One opener at Derby County through injury, with Sam Baldock also sidelined due to a thigh issue.

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Meanwhile, winger Jodi Jones was unavailable as he was not registered in time after his transfer went through on Friday, but took part in the warm-up at Pride Park.

The U’s lost 1-0 and host Cambridge United this Saturday in their first home game of the season.