Burke, 19, joined the Bundesliga club from Nottingham Forest this summer in a deal believed to be worth around €15 million.
Emotions run high and tempers flare on sidelines across the Bundesliga for managers young and old.
Karl-Heinz Rummenigge suggests Bayern Munich's effort to re-sign Robert Lewandowski is moving in the right direction.
United States international Johannsson has lost his place in the Bundesliga side's attack to 19-year-old Ousman Manneh.
Poland international Lewandowski, 28, signed a five-year deal when he joined Bayern on a free transfer from Borussia Dortmund in 2014.
Leverkusen crashed out of the DFB Pokal on Tuesday after losing in a penalty shootout to third-tier club Sportfreunde Lotte.