Frank is impressed by Bergvall's progress and describes him as a player on the rise.
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"He goes from strength to strength," said Frank.
"I think you can say he did well last season. He played a lot and laid the foundation for this season. Because at the beginning of the season he came back from that foot injury from last season and he needed some time to be ready."
Frank continued: "Now you can see that he is going from strength to strength and has that little extra confidence.
"I think the coaches and I have worked with him on a couple of points. He has so much energy that sometimes you need to say 'pause, stop, don't run when we have the ball'. And instead find higher and more dangerous positions."