Glen Johnson has confirmed England players used caffeine tablets before their scheduled World Cup qualifier against Poland on Tuesday.
Heavy rain saw the game postponed and eventually played on Wednesday afternoon instead, with Roy Hodgson's men producing a lacklustre display to draw 1-1 in Warsaw.
Reports emerged on Thursday that the team had attempted to combat the use of caffeine tablets by then taking sleeping pills in the hope of getting some rest on Tuesday night.
The Football Association refused to comment on the claims but the England right-back has spoken out, admitting the circumstances were not ideal.
Johnson told the Daily Telegraph: "A lot of the lads take ProPlus tablets before the game and we all took that for the game. Then the game is off and no one can sleep.
"It's not ideal preparation but I'm not blaming that for one bit. It was the same situation for them so it was just strange circumstances."