When Erik ten Hag first got a glimpse of the potential of Mason Mount the midfielder was an 18-year-old who was still yet to play a minute of senior football in England.
A loan move to Vitesse Arnhem, who had a productive link with Chelsea at the time, was the making of Mount, confirming the talent the teenager had and setting him on his path to the first team at Stamford Bridge, via another loan with Derby County.
Mount scored 14 goals and finished with nine assists in the 2017/18 season, a productive campaign for himself and for Vitesse, who finished sixth and qualified for the Europa League through an Eredivisie play-off system, a run of games in which their on-loan teenager proved to be vital, scoring five of his goals in three games.
That loan spell alerted Chelsea to his qualities, but it also set in motion a transfer that has been five years in the making.