Football Association chief executive Martin Glenn has claimed that Sam Allardyce's behaviour has been "inappropriate" and not "what's expected of an England manager".
The 61-year-old has vacated the Three Lions hotseat after a report in The Telegraph accused him of telling reporters that it was possible to "get around" an FA rule, introduced in 2008, banning third parties from owning part of a player's economic rights.
Speaking on Tuesday evening, shortly after Allardyce's departure was confirmed, Glenn told reporters: "It's been a very difficult 24 hours.
"In light of the media allegations we've seen we've concluded, and Sam's agreed, that his behaviour has been inappropriate and not what's expected of an England manager discussing a range of issues from potential contraventions of FA rules to personal comments that frankly don't work when you're the manager of England."
An FA statement confirmed that England Under-21 boss Gareth Southgate will take charge of the senior team for the next four matches against Malta, Slovenia, Scotland and Spain.