Heitinga spent five years as an Everton player between 2009 and 2014, making 140 appearances for the club. He later hung up his boots at Ajax, before embarking on a coaching career with the Amsterdam giants. Last season, he was a first-team coach under David Moyes at West Ham. The 40-year-old could become the latest appointment to Slot's staff after last month's announcement regarding arrivals of Sipke Hulshoff and Ruben Peeters from Feyenoord, as well as Fabian Otte from the USMNT. Aaron Briggs has also joined as an elite development coach.