Frank has been impressed by Bergvall's growth and development, describing him as a player on the rise.
"He's consistently improving," Frank said.
"I think he did well last season. He played a significant amount and laid the groundwork for this season. Considering he returned from an injury at the start of the season, he needed some time to get back up to speed," Frank explained.
Frank continued, "Now, it's clear that he's building on his previous progress and gaining confidence.
"We've worked with him on a few areas, particularly to utilize his energy more effectively. Sometimes, he gets too eager and needs to be told to slow down and find better positions on the field," Frank noted.