Isaiah "Izzy" Jay Brown (born 7 January 1997) is an English former professional footballer who played as an attacking midfielder.

[16] Three days after the match, on 3 February, Brown was promoted into Mourinho's first team squad alongside fellow teenager Ruben Loftus-Cheek.

[17][18] On 12 April, Brown was named on the first team bench for the third time that season for a West London derby against Queens Park Rangers.

[20] On 18 May, Brown made his Chelsea debut, coming off the bench for Loïc Rémy for the final eleven minutes of a 3–0 defeat at his former club West Bromwich Albion.

[23] A week later, Brown made his debut and played for the entire first half in a friendly 1–0 win against the Turkish side Çaykur Rizespor.

[24] He made his competitive debut 13 days later in a UEFA Europa League third qualifying round first leg against Southampton at St. Mary's, playing the full 90 minutes of a 3–0 defeat.

[25] On 6 March 2016, Brown scored his first senior goal, giving Vitesse the lead in the 34th minute in their 2–1 victory over Roda JC Kerkrade.

On 7 January 2017, Brown made his Huddersfield debut in an FA Cup tie against Port Vale, which resulted in a 4–0 victory for the Championship side.

[34] Brown featured in Huddersfield's Championship play-off final victory against Reading on 29 May 2017, playing 98 minutes before being substituted for fellow Chelsea loanee Kasey Palmer.

[36] On 25 July 2017, Brown joined newly promoted Premier League club Brighton & Hove Albion on a season-long loan.

[39] On 8 January 2018, in Brighton's 2–1 FA Cup victory over Crystal Palace, Brown suffered an anterior cruciate ligament injury and missed the rest of the season.

[58] On 22 June 2021, Brown signed for Championship club Preston North End on a one-year deal, with an option of an extra year.

[59] On 20 July 2021, it was announced that Brown suffered a ruptured Achilles during pre-season training, which was expected to keep him sidelined for "a significant period of time".