This time it was his ankle which was thumped by a late challenge from Sporting Kansas City's Honduran hardman Roger Espinoza after just 30 minutes.
Simpson, was gutted for the £5million ace and said: "We were all concerned for him.
"We know exactly what he's been through and how hard he has worked to come back."
Boss Alan Pardew insisted after a drab 0-0 draw Ben Arfa, who has now flown back to Tyneside for more checks, was "OK".
But the player, 24, left the Toon hotel on crutches wearing a protective cast on his leg.