"I believe in the miracle and very much hope that we will soon hear positive news from Michael," Sport24 quoted Berger as saying.
Not much is known about Schumacher's current condition following a skiing fall, but it was emerged in court earlier in May 2017 that he still could not walk.
Schumacher, who holds the record of seven Formula One titles and 91 race wins between 1991 and 2006, suffered from head injuries while skiing during a French Alps vacation in 2013.
Last May, Schumachar was honoured for his life's work. He was awarded with the inaugural ' Nurburgring Award' trophy for winning at the fabled circuit for a record five times in Germany.
Image: Michael Schumacher
Photograph: Alessandro Bianchi/Reuters