Frank spent three years in charge of Brondby earlier in his career.
He told Bold: "Jesper Srensen has really done well in Brndby. I am impressed by his work in bringing Brndby all the way to the top of the Super League.
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"Because the season didn't start so well with defeats in two of the first three games.
"It will be very close, but why shouldn't Brndby be able to win the championship now that they are also leading the league."