DALLAS (AP) — Mavericks point guard Derek Fisher left Dallas’ game against the Philadelphia 76ers on Tuesday night with a strained right knee.

Fisher had his shot blocked by Evan Turner and went down to the floor holding his knee after he landed. He walked slowly to locker room with 6:50 left in the first quarter.

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The team said Fisher’s return to the game is doubtful.

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Dallas coach Rick Carlisle told reporters before the game that Fisher wasn’t going to play because of the flu, but the 17th year veteran started before his early exit.

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Fisher signed as a free agent with the Mavericks on Nov. 29. The 17th-year guard came in averaging 9.4 points and 3.9 assists in eight games this season.