It will be a second season on loan in the Premier League for the 21-year-old, who made 32 appearances and scored two goals for West Brom last term. He has previously spent time at Charlton Athletic and Swansea City in the Championship, amassing 77 senior games in total over the past two years.

The midfielder joins an evolving Palace side now managed by former Arsenal captain Patrick Vieira, as well as reuniting with Chelsea Academy team-mate and fellow England Under-17 World Cup winner Marc Guehi, who made a permanent switch to the Eagles earlier this month.

Gallagher has been on the books at Chelsea since the age of eight and won numerous trophies with our Under-18s, including an unprecedented quadruple in 2017/18. He embarked on a first move into professional football while still a teenager after winning the Academy Player of the Year award, impressing during six months at the Valley in which time he missed just one Championship game and scored six goals.

In a mid-season switch of clubs he swapped struggling Charlton for promotion-chasing Swansea, where he joined close friend Guehi and the pair’s England Under-17 manager Steve Cooper. With the Swans, Gallagher dramatically secured a play-off spot on the final day of the regular season but the Welshmen were beaten in the semi-finals by Brentford.

Those exploits in the second tier earned the England Under-21 international a Premier League move last summer with West Brom, where he was a regular in midfield. Despite the Baggies’ struggles, first under Slaven Bilic and then Sam Allardyce, Gallagher played 2,683 minutes of football and won the Young Player of the Year award for a club that were ultimately relegated.

After returning for pre-season under Thomas Tuchel and featuring in friendlies against Peterborough United and Bournemouth, the youngster now heads across the capital for a season at Selhurst Park.

Palace finished 14th last term and begin their new campaign at Stamford Bridge against Chelsea, although Premier League rules mean Gallagher will not be eligible to face his parent club. His debut could therefore come at home to Brentford the following weekend.