Seamus Coleman
Seamus Coleman limped out of Everton's 1-1 draw against Southampton at Goodison ParkGetty

Everton right-back Seamus Coleman is a major injury doubt for Everton ahead of what is likely to be a pivotal week in the tenure of Roberto Martinez. The Republic of Ireland international has made 34 appearances in all competitions so far this term, but appears set to miss a Merseyside derby against Liverpool on Wednesday (20 April) as well as the FA Cup semi-final meeting with Manchester United at Wembley four days later.

Coleman started the Premier League clash with Southampton at the weekend, featuring for 54 minutes before a hamstring complaint led to him being replaced by academy graduate – and first-team debutant – Callum Connolly. Speaking after a frustrating 1-1 tie that saw Ramiro Funes Mori's deflected opener cancelled out by a ninth goal of the season from Sadio Mane, Martinez was far from optimistic about the player's chances of recovering sufficiently in time for the two upcoming key fixtures.

"He felt his hamstring and we will assess him in the morning but it will be hard to see him being involved this week, as that sort of injury takes longer than a week," he was quoted as saying by the Liverpool Echo.

The Toffees are dealing with a number of injury problems to key players at present after top scorer Romelu Lukaku and playmaker Ross Barkley were both relegated to the bench, with Aaron Lennon and Tom Cleverley missing out altogether . Defensive fitness concerns will be of particular concern ahead of two crucial fixtures, with both captain Phil Jagielka and regular left-back Leighton Baines having sat out the recent draw at Goodison Park.

Disillusionment with Everton's persistent underachievement under Martinez has come to the boil in recent weeks, with banners calling for his dismissal were clearly visible during last week's visit to Watford. The Spaniard, who began his managerial career with an impressive stint at Swansea City and later won the FA Cup with underdogs Wigan Athletic, was later approached by a disgruntled supporter during an U21 fixture against Chelsea. An angry fan also ran onto the pitch after Mane's equaliser against Southampton, confronting midfielder Leon Osman and attempting to remonstrate with the manager.