Frank is being linked with a move away from Brentford this summer, with interest in him at a high level.
The likes of Bayern Munich and Manchester United are being linked to Frank's signature.
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On Sunday, Frank said: Overall, this season has been a success.
We are ambitious, we want more and we are dreaming of more, but the foundation we are standing on is good. I am excited about the future."
One who is departing the club is Neal Maupay, who is going back to Everton after the end of a loan spell.