Manuel Javier Vallejo Galván (born 14 February 1997) is a Spanish professional footballer who plays for Valencia CF as either a winger or a forward.
On 7 February 2019, La Liga side Valencia CF reached an agreement with Cádiz to sign Vallejo; the player remained on loan at the Amarillos until June. On 2 September 2019, due to the arrival of Thierry Correia, Vallejo changed his shirt number from 2 to 15. He made his debut in the top tier on 28 September 2019, coming on as a 69th-minute substitute for Maxi Gómez in 1–0 away victory against Athletic Bilbao, and his Champions League debut on 5 November 2019 when he came on as a 59th-minute substitute for Lee Kang-in in a 4–1 home thrashing of French side Lille.
Vallejo scored his first goal in the main category of Spanish football on 21 December 2019, netting a last-minute equalizer in 1–1 away draw against Real Valladolid.