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The right-back has been an ever present in the Premier League for the Hammers this season but was forced to miss the Europa League victory over Rapid Vienna last Thursday with an injury.
The nature of the injury was not revealed but Coufal returned to the side to face Brentford in the League on Sunday.
Although he was not at his best, that was true for the West Ham team as a whole with the visitors deservedly winning 2-1.
The Czech squad does include two other Hammers in midfielders Tomas Soucek and Alex Kral.
As well as Coufal, the Czechs suffered more loses today with the Slavia Prague trio of defender Jan Boril and midfielders Lukas Masopust and Petr Sevcik pulling out due to injury.
The Czechs have collected seven points from five matches in Group E, level with Wales but sitting in second place on goal difference behind runaway leaders Belgium.
After hosting Wales on Friday, the Czechs travelling to face Belarus on October 11. Wales are without captain Gareth Bale due to a hamstring injury.