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Is it usual for the AVAR to be an AR, as thought it was normally a ref, but Lee Betts is with Michael Oliver this week.
I was thinking that.
Perhaps it indicates the lack of English FIFA referees. If Attwell/Tierney are out on Wednesday or Thursday - eitehr as VARs in Champions League or refereeing in Europa League - then it might be they're struggling for numbers with Pawson away currently.
Perhaps it’s a change in policy for countries that are using VAR in their domestic leagues. In some of the other appointments on Tuesday (eg Makkelie and Rocchi), FIFA ARs are being used assistant VARs as well.