Police officers have been on duty at the entrance to the Worcester Arena after the travellers were reported to be parking up on the site on Wednesday, July 2.
Yesterday evening, the university issued a statement saying: "All University of Worcester sites are open as usual. The university is working alongside the authorities to resolve this matter."
The arena, which can seat up to 2,000, opened in April 2013 and is home to the of Worcester Wolves basketball team, as well as being a national centre of excellence for disability sports.
On Sunday, it is the venue for the Central England 18th Open Karate Championships, organised by the English Karate Federation.