Everton have described right-back Seamus Coleman's hamstring problem as a "minor soft tissue injury".
No timescale has yet been put on the Republic of Ireland international's return but the diagnosis might ease fears the 25-year-old could be out for a few weeks.
Coleman, who has been in fine form this season, limped off during the Toffees' 1-1 draw at West Brom in the Premier League on Monday.
A statement on the club's website added: "He has been closely monitored by Blues medical staff since then and has already begun his recovery."
Ireland's next game is at home to Serbia on 5 March.