Travellers who have been moving across Wiltshire and Gloucestershire have been ordered to leave their current site in Fairford.
The travellers have previously been forced to leave sites in Highworth and Lechlade and are now at the Coln House School playing fields.
Officers from Gloucestershire County Council visited the site yesterday.
A council spokesperson said: “We visited the rugby field at Coln School, Fairford to carry out a welfare check and serve a section 77 notice which informs the travellers that they are illegally occupying land at the rugby club and should leave the area immediately.
“If they remain, our next action would be to serve a court summons which will allow us to obtain a court order and instruct bailiffs to move them on.
“As soon as the site is vacated, we will arrange for it to be cleaned straightaway.”