Trapp suffered the injury during a publicity shoot with Germany's Under-21 team on Monday and tests in Frankfurt on Tuesday revealed fractures to his left hand and middle finger. He will have the operation on Friday.
"It is a regrettable injury and a major setback for Frankfurt," club boss Heribert Bruchhagen said. "The chance of him playing again this season is minimal."
"We will discuss these results with the DFB (German football association) and examine in detail the process of the accident."
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