The USA international has only made eight appearances for the German giants this season and has also lost his place in the national squad.
He has endured a tough few months after picking up a hip injury last year and Johannsson has failed to establish himself since returning.
Reports earlier this week suggested he could move elsewhere this summer and now the 26-year-old has confirmed he is struggling on the sidelines.
"It's not my desire to leave but at the end of the day it's important that I play," he is quoted as saying by ESPN FC. "I love football but I need to play to be happy.
"It's the most difficult period of my career: I can play but I am not allowed to. It's disappointing but not surprising when you've not played a minute in four weeks."