By Alex Stevens

Muhamed Besic has revealed on Twitter that he will be sidelined for six months with a knee injury in a crushing blow to Everton ahead of the new season.

The Bosnian midfielder was helped off just 12 minutes after coming on as a substitute in Wednesday’s Wayne Rooney testimonial match at Old Trafford.

The specific nature of the injury has not yet been confirmed but the timeframe for rehabilitation suggests that it is a potential cruciate ligament injury.

Besic posted a message on his Twitter account on Friday morning which simply read “6 months out! #devastated”.

It means the 23-year-old injury-plagued midfielder will be missing until at least February.

Besic, who was voted Everton’s player of the month in January, has become a firm favourite at Goodison Park because of his combative style since his £4million move from Hungarian club Ferencvaros in 2014.

But his promising Everton career has been ravaged by a succession of injuries. A hamstring injury sustained against Chelsea last September ruled him out for four months, then a recurrence sidelined him again until March.

The signing of Idrissa Gueye in midweek will soften the blow of Besic’s absence, but Ronald Koeman is likely to step up his search for midfield reinforcements.

In other Everton team news, the club have been given a major boost in their pursuit of a prime summer target.