Chalobah was previously loaned to Watford in 2012-13, making 38 appearances for them in the Championship. It was the first of six loan spells, including a year in Napoli.
Despite his young age, he has also been at Nottingham Forest, Reading, Burnley and Middlesbrough, racking up over 100 first team appearances. Watford offer a better chance of increasing that number significantly than staying with Chelsea.
Having sought assurances about playing time, Chalobah has decided to leave Stamford Bridge for the sake of his career. Although well-regarded by Antonio Conte, he faces strong competition for places at Chelsea and is unlikely to feature beyond appearances from the bench.
No fee is yet agreed and with Tiemoue Babayoko arriving from French champions, Monaco, the youngster is facing an ever-growing queue for his favoured midfield berth.
His desire for first team action was fuelled this summer by a starring role for England at the European Under-21 Championships in Poland. The Young Three Lions, spurred on by the Under-17s winning the Little World Cup, reached the semi-finals where they were beaten 4 – 3 on penalties (after forcing a 2 – 2 draw) by Germany.