The England U21 squad has left the St George's Park complex after a suspected stomach virus was discovered on site.
Players themselves have not been affected by the problem but some visitors to the site in Staffordshire felt unwell over the weekend.
Gareth Southgate's U21s have been training at St George's in preparation for their European Championship qualifying double-header against Finland and San Marino.
The senior England squad were also due to pay a visit to the complex ahead of their friendlies against Chile and Germany but Roy Hodgson's squad will now be kept away as a precaution.
"To date, the England U21 squad has not experienced any symptoms related to the virus. They have been on site since Sunday," read a statement on the FA's official website.
"However, as a precautionary measure, the U21s are moving hotels and the England senior team will now not meet at St George's Park. Alternative accommodation and training arrangements have been made for both teams.
"This is an elite athlete precaution for the two senior teams. Normal operations continue for the SGP and hotel staff, customers and the public."
England seniors will now report to the Grove in Watford on Tuesday before
training at Colney, while the U21s have relocated to Milton Keynes.