The England medical team were assessing the pair on Monday afternoon before making a decision on whether they return to their respective clubs for treatment.
England boss Gareth Southgate has not yet specified what the injuries are.
The rest of the 26-man squad trained as normal at St George's Park while those who were in Premier League action on Sunday were having recovery sessions away from the main squad.
England lead Group F by five points and will book a place in Russia next summer with a win over Slovenia at Wembley on Thursday.
The Three Lions then travel to Lithuania three days later to finish their World Cup qualifying campaign.