Daniel Sturridge and Theo Walcott failed to attend England's training session on Monday morning due to illness, just one day before the World Cup qualifier against Ukraine at Wembley.
• Lampard never thought of quitting
Despite the pair training on Sunday, they both complained that they had felt unwell overnight, leaving Roy Hodgson with just 18 players at Arsenal's London Colney training complex.
It follows a frustrating period for Hodgson in which a range of players have had to withdraw from the squad due to injury, with John Terry the most recent.
A further update on the duo's condition will be given when Hodgson stages his pre-match press conference on Monday afternoon.