Harmison could be retained if they opt for outright pace and hostility on what is expected to be a hard Oval pitch, where the possibility of playing two spinners - with Monty Panesar joining Graeme Swann - has also been mooted.
Meanwhile, chairman of selectors Geoff Miller has defended the decision to omit Flintoff at Headingley.
"We had to guarantee that 'Fred' could do the job required to bowl the overs," Miller told BBC Radio 5 live.
"We'd been monitoring his injury day by day and the selectors felt that it was better that he didn't play in that game.
"Yes, he might have thought he was fit to do a certain job, but we had to work out whether he'd be fit to do a constant job, meaning bowl the amount of overs required to get the 20 wickets.
"We have to go on the medical advice. We know that Freddie's passionate to play for England, I accept that, but there are a lot of other ideals we have to work to, such as taking medical advice.
"If the medics say there's still a problem there, then we have to accept what their viewpoint is."
Flintoff was conspicuous by his absence from the England balcony for the duration of the Headingley Test, but Miller said there is no rift.
"Everything is fine with 'Fred'. No problems whatsoever," he said. "He knows the situation, he knows there's a problem there and we will monitor that day by day.
"The England side, when Freddie's performing to his maximum as we saw at Lord's, is a terrific side and it disappoints him when he's not playing."
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