Westley has been named alongside another new name in the Test squad in Middlesex's Dawid Malan, who could yet feature if England decide to included an extra batsman, probably at the expense of the spinner Liam Dawson, when they confirm their starting line-up next week. "I've felt good the last few years at Essex".
There is no place in the squad for the uncapped Mark Stoneman, who was strongly tipped for a first call-up on his home ground. So if there's ever a time to play it would be now.
South Africa levelled the four-match series at 1-1 on Monday, thrashing England by 340 runs on the fourth day of the Trent Bridge test.
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Malan made his England debut last month in the deciding T20 against South Africa in Cardiff, where he impressed with 78 off 44 balls.
Though there is still a week to go before the match begins at the Oval on July 27, England selectors have confirmed that Westley, who has scored 478 runs at an average of 53.11 in this year's County Championship, will bat at number three. He has a first-class average of 38, with 18 hundreds.
Westley, has been a heavy domestic run-scorer at Essex over the past three seasons, is a right-hander and would thus break up England's left-hand dominated lineup.
Toby Roland-Jones has been retained in the squad with Jake Ball not quite ready yet to return after a knee injury.