Chalobah had already been out on loan previously at Watford, Nottingham Forest and Middlesbrough but things didn't work out for him at Turf Moor and he returned to Stamford Bridge having made just four substitute appearances.
He spent the second half of last season at Reading in the Championship but it looked as though he was about to stay with parent club Chelsea this season until a late deal took him to Italy.
He's signed a season long loan with SSC Napoli. They must have a lot of players too; he's been given squad number 94.