Sundowns lost the two key players during the current transfer window, with Tau joining English Premiership side Brighton & Hove Albion, while Billiat signed for Kaizer Chiefs.
“We lost two important players, Khama Billiat and Percy Tau to the English Premier League. So that creates a little bit of a difference,” Mosimane told the media.
“It’s football, it’s the power of the Euro, we have to sell the players. But I don’t think we are weak.”
Meanwhile, the Brazilians are facing the possibility of an early exit out of the Caf Champions League after losing 1-0 to Wydad Casablanca over the weekend.
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