Gibson a doubt for Everton's season opener

The midfielder damaged his knee just before half-time during Sunday's 2-1 win over Real Betis, and joins Antolin Alcaraz on the sidelines ahead of facing Norwich City

Darron Gibson is a doubt for Everton's first league game after picking up a knee injury in their friendly on Sunday.

The 25-year-old hobbled off the field just before half-time in the 2-1 win over Real Betis, which came courtesy of a Nikica Jelavic strike and a Stephan Andersen own goal.

But with the season opener against Norwich City just a week away, new manager Roberto Martinez has confirmed that Gibson may not be available.

"Darron is the only negative [from the game]," the Spaniard told the club's official website. 

"We have been quite fortunate in the pre-season not to pick up too many knocks and bruises but Darron opened his knee slightly and has a grade one ligament problem.

"We will have to assess it over the next 48 hours and we’ll have a clear idea of where he is."

The Republic of Ireland international has been a regular fixture for the Premier League side since joining last year - starting 22 games - and he is not Martinez's only worry.

The 40-year-old will also be without summer signing Antolin Alcaraz, with the Paraguay international suffering with a hamstring problem.