The striker, who had signed with Cardiff City, was killed in the crash along with pilot David Ibbotson.
A 64-year-old man from North Yorkshire had been arrested and released while investigations continue, a spokesperson for Dorset Police said.
The force added the families of the two men who died had been informed.
Mr Sala, 28, had been travelling from Nantes to Cardiff on 21 January when the plane he was in lost contact with air traffic control north of Guernsey.
His body was recovered in February but Mr Ibbotson's has never been found.
