Hull’s opponents on the weekend of their positive tests, Salford, also had to isolate a significant percentage of their squad for two weeks, though none have since tested positive.
Catalans are due to start hosting games in Perpignan from September 7 and hoped to do so in front of crowds following the lifting of restrictions in France.
They had also been granted quarantine exemptions for travelling on a weekly basis to England as they have been using chartered flights.
A statement from Super League reads: “The Dragons squad were all instructed to isolate as soon as the news of the positive tests was received, prompting the postponement of the Wigan fixture. They will have further tests later this week.
“Of the players who have tested positive, two played in Saturday’s Coral Challenge Cup tie against Wakefield Trinity. Test and trace analysis has shown that two of the Wakefield players will also be required to self-isolate – but at this stage their fixture against Warrington Wolves is expected to go ahead as scheduled on Sunday.”