Czech captain Tomas Rosicky sustained an unspecified injury, while Hertha Berlin playmaker Vladimir Darida had surgery after injuring an ankle.
Boro defender Gibson has impressed at the start of his first season of Premier League football, sparking speculation that Allardyce will call him up.
Verratti joined PSG in the summer of 2012, with his arrival in the French capital from Pescara overshadowed by the unveiling of Zlatan Ibrahimovic.
FIFA has denied Serbia's request to transfer former Barcelona forward Bojan Krkic's international eligibility.
Iceland will not be in the new FIFA 17 video game after the country's football association (KSI) refused an offer to sell the rights to EA Sports.
The Three Lions, who saw off Slovakia 1-0 earlier this month, next face Malta at home on Oct. 8 as they continue their World Cup qualifying campaign.