It will be a first taste of regular senior football for the 18-year-old defender, who joined Chelsea from PSV Eindhoven in his native Netherlands in the summer of 2018. Since then, he has demonstrated his versatility as a left-back, wing-back, centre-back or central midfielder, impressing both with his attacking intent and defensive solidity.
In September 2019, aged 17, the Dutchman made his senior debut for the club in our 7-1 Carabao Cup thumping of Grimsby Town, playing the final 24 minutes as a substitute.
A European Championship winner at the Under-19 age group with the Netherlands last year, Maatsen signed a new long-term contract in March and now crosses the capital to the Valley. Charlton have picked up four points from their opening four games since relegation to League One and take on Wigan Athletic at home this weekend.