Karl became Bayern’s youngest Champions League goalscorer in style after his finish against Club Brugge last week, breaking a record set by Jamal Musiala as he scored within 5 minutes in front of 75,000 spectators at the Allianz Arena.
Bayern boss Vincent Kompany joked that his form is not normal and that he will be keeping an eye on the teenager after the game.
"This isn't normal. I'm not a fan of the hype he'll get now. I'm a fan of training and calm. We'll see what he shows and just move on,"
Star striker Harry Kane also praised the teenager who is suddenly under the limelight at the club who believe he is the next star.
“Brilliant Champions League night at the Allianz. Congrats Lennart Karl on a night to remember! Gotta keep this momentum going.”
Now, writing in his Sky Sports column, Matthaus says Karl can become the next Musiala with the right backing and as long as he has the right mindset.
"Can Karl follow the path Jamal Musiala took before him? The possibilities are always there; it's up to the player himself, and he needs a coach who trusts him.
“I think Kompany trusts him based on his recent performances and isn't worried about benching or substituting a seasoned player for him. And I believe Karl will get regular playing time because he's delivered when he's been on the pitch.
"Karl will be deployed regularly. Vincent Kompany has slowly introduced Karl to the team, with brief appearances in the Bundesliga, the DFB Cup, and last week, his first full 90 minutes in the Champions League.
“Karl caused a sensation with his goals against Bruges and Gladbach, but he still needs to show up in training every day. He's ambitious and wants to develop - those are the basic requirements."
Karl scored his first Bundesliga goal against Borussia Mönchengladbach at the weekend as he continues his meteoric rise. He has gone from youth prospect to key contributor for Kompany who may be tempted to keep him in the first team for the foreseeable future alongside the recovering Musiala.