Gareth Southgate will consider returning to the three-man defence England used at the World Cup in the wake of Friday's loss to the Czech Republic.
Frailties were exposed in a 2-1 defeat that prevented the Three Lions from booking their place at Euro 2020 as Michael Keane in particular struggled behind a midfield pairing of Declan Rice and Jordan Henderson.
The poor showing in Prague has forced manager Southgate to rethink his move away from the formation that served him well in Russia.
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Harry Maguire, John Stones and Kyle Walker, now dropped from the squad, formed a reliable back three en route to the semi-finals.