Rotherham United's Championship fixture against Middlesbrough on Boxing Day has been postponed after more positive Covid-19 tests at the Millers.
The club has not disclosed the number of positive tests, but say they cannot fulfil the fixture due to players and staff having to self-isolate.
The Millers' game with Derby County on Saturday was called off after one positive test in the squad.
At the time, the club said more players had shown Covid-19 symptoms.
It is the second Boxing Day Championship fixture to be postponed due to positive tests - Millwall's trip to AFC Bournemouth was called off earlier in the week after a number of positive tests at the Lions.