An England and Wales Cricket Board (ECB) statement on Tuesday said Bell had sustained the injury during fielding practice on Monday.
The statement added: "Ian Bell underwent an ultrasound scan today (Tuesday) and has a minor grade one tear to his left groin following fielding practice Monday. He'll continue to be assessed."
England play the first of two back-to-back Twenty20 internationals against the West Indies at The Oval on Thursday.
The teams then play three full one-day internationals at Lord's on Sunday, July 1, Edgbaston on Wednesday, July 4 and Trent Bridge on Saturday, July 7.