Seven time champion Schumacher, now 43, signed a three-year contract when he agreed to return to formula one in 2010 with Mercedes.
The two sides are yet to agree an extension for 2013 and beyond.
But Norbert Haug, Mercedes' motor racing vice-president, ramped up speculation recently when he responded to a question about a new deal for Schumacher: "I doubt there will be an announcement at Spa."
Rumours indicate the great German could ink a new two-year contract, which would mean he is still pushing for championships at the age of 45.
Asked about the age factor, Schumacher told DPA news agency this week: "Age has nothing to do with it.
"Anyway, at the moment it (the title) is not a topic as - unfortunately - we are no longer fighting for the championship. We'll see what the future brings," he added.
Danner, who contested grands prix in the mid 80s and now travels to the races for German RTL television, said: "I'm quite sure the decision has been taken now."