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Jason Roy has hit nine centuries in 80 one-day internationals for England

England v Afghanistan, ICC Men's Cricket World Cup Venue: Old Trafford Date: Tuesday, 18 June Coverage: Live Test Match Special commentary on BBC Radio 5 Live Sports Extra. Text commentary on BBC Sport website, plus desktop, tablets, mobiles and app.

Opener Jason Roy will miss England's next two World Cup matches, with captain Eoin Morgan not ruling out calling up Alex Hales later in the tournament.

Roy tore a hamstring in Friday's win over West Indies, while Hales was dropped in April for reportedly failing a recreational drugs test. external-link

"If [national selector] Ed Smith felt that Alex was the best option, we would have to assess how that would sit in the changing room and the stigma it would bring," Morgan told BBC Sport.

Roy will be replaced by James Vince for Tuesday's match against bottom side Afghanistan at Old Trafford and Friday's meeting with Sri Lanka at Headingley.

Morgan himself may be fit for against Afghanistan after suffering a back spasm against West Indies.

When Hales was dropped from the World Cup squad after serving a 21-day suspension, Morgan said it was because of "complete breakdown in trust" between the batsman and the rest of the squad.

Although Morgan said there has been no discussion of replacing Roy, he did not deny that Hales would be considered should the need for batting cover arise.

Morgan added: "It's not a conversation that we have had with Ed Smith or [coach] Trevor Bayliss.

"We have not considered replacing any players yet. When we did the original selection, we outlined a number of players that could replace players if they got injured, but since then we haven't spoken to the selection panel."

Roy missed seven weeks of action after suffering a hamstring injury earlier this year.

He was injured while fielding at Southampton, did not bat in the England innings and had an MRI scan in London on Saturday.

"I certainly believe Jason will play again in this tournament," said Morgan.

"He might be back against Australia or maybe for the following game. It depends how he responds to treatment and medication.

"I'll be very conscious of not pushing it, but that will also be dependent on results, how we're going in the tournament and what games we need to win to get into the semi-finals."

Morgan hobbled off in the eight-wicket victory over West Indies, but said he is now "moving freely".

"The response to the treatment has been very good, but we don't know how we'll pull up tomorrow," he said.

If Morgan is unfit, his place could go to off-spinning all-rounder Moeen Ali, who has missed England's past two games.

Moeen could also return if England opt for a second spinner instead of their recent tactic of four frontline pace bowlers.

England are fourth in the 10-team table, having won three and lost one of their first four games. Afghanistan are bottom with four defeats from four matches.

The top four sides qualify for the semi-finals.

'England defeat would be biggest upset in World Cup history' - analysis

Cricket correspondent Jonathan Agnew

Not only have Afghanistan not won a single game, but they haven't come close, their batsmen failing on every occasion.

Although their bowlers are useful on a used pitch such as the one they will be playing on at Old Trafford, England should deal with them comfortably enough.

If England slip up it would rank as the biggest upset in the history of the World Cup.