The Pittsburgh Penguins frequently give prospect Daniel Sprong rave reviews, yet it seems like they believe that he still needs some seasoning before making a dent at the NHL level.

Sprong and fellow intriguing forward Zach Aston-Reese headlined a group of 21 players the Penguins demoted to the AHL on Tuesday.

Here is the full list:

Forwards Zach Aston-Reese, Teddy Blueger, Jean-Sebastien Dea, Thomas Di Pauli, Adam Johnson, Sam Miletic, Dominik Simon, Colin Smith, Daniel Sprong, Christian Thomas, Freddie Tiffels and Garrett Wilson; defensemen Lukas Bengtsson, Frank Corrado, Kevin Czuczman, Ethan Prow, Chris Summers, Jarred Tinordi and Zach Trotman; and goalies Casey DeSmith and Tristan Jarry have all been returned to WBS.

Sprong, 20, was the 46th pick of the 2015 NHL Draft. He’s been generating solid numbers at the OHL, so it will be interesting to see how he converts that to AHL work. Sprong played 18 regular-season games for the Penguins back in 2015-16, notching two goals.