Mayo could be without a number of players for Sunday's Connacht football semi final with Leitrim in Castlebar.
The county board say they are working with the HSA on "a number of Covid-19 related queries", but declined to say whether or not there was a positive case in their squad.
Manager James Horan named his starting 15 for the game last night, but did not give details of his substitutes bench.
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