The Bora-Hansgrohe cycling team was excluded from the Belgian E3 Saxo Bank Classic on Friday after one of its riders returned a positive Covid-19 test.
In a statement the German team said that British rider Matthew Walls had tested positive.
"After Walls' positive test result was received and confirmed by a second test, several PCR tests were carried out on all other team members yesterday, all of which were negative," the statement said.
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"Despite this, according to the instructions of the Belgian Cycling Federation, the team is not allowed to take part in today's race."
The race is part of the build-up towards the Tour of Flanders which takes place on April 4.
In a separate race, Spanish team Kern Pharma said on Friday that they were leaving the Tour of Catalunya following two positive cases within their squad.

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