Marcos Javier Yáñez Fernández (born 10 April 1977 in Boiro, A Coruña), known as Changui, is a Spanish footballer who plays for Ribadumia CF as a striker.
He played most of his career with Galician teams.
Having first played as a professional with SD Compostela, appearing in La Liga during the 1997–98 season by playing six matches and scoring one goal, against Racing de Santander in a 1–1 away draw, Changui went on to represent several second division clubs before being purchased by Deportivo de La Coruña in 2002, although he would play almost no part during his tenure (two league appearances in the 2004–05 campaign, 13 minutes played), also serving a loan to UD Las Palmas.
In August 2005 Changui was again loaned, this time to Greek side Skoda Xanthi FC. Months later he came back to Spain without his parent club's permission, facing the subsequent and pertinent disciplinary proceedings; the player was summoned by Deportivo on 8 March 2006 but did not appear, sending instead his agent, who stated that he did not know about the player's departure from Xanthi until the Spaniards took action.
Finally, Deportivo cancelled Changui's contract on 9 June 2006. He reacted demanding the club for unpaid wages, having signed for Galician neighbours CF Extremadura in the previous year.
After being released by Extremadura, Changui joined SD Ciudad de Santiago in the fourth level. He helped it achieve promotion to division three in 2007–08 and, in 2009, resumed his career in the amateur leagues in his native region.