Swansea boss Paul Clement has expressed his surprise that Chelsea allowed Nemanja Matic to join Manchester United as he prepares for a reunion with the player.
Clement worked with Matic during his time as Carlo Ancelotti's assistant at Stamford Bridge before the holding midfielder joined Benfica in 2011.
Matic returned to Stamford Bridge two-and-a-half years later and was a driving force as Chelsea won two Premier League titles in three seasons.
But Chelsea sanctioned Matic's £40million transfer to Old Trafford last month - and the 29-year-old Serbia international made an impressive start to his United career with a man-of-the-match performance in the 4-0 season-opening victory over West Ham.