Fernández began his career with Athletic Bilbao, making his first-team debut in La Liga in 2013. Known for his finishing in front of goal, he later played for clubs such as Elche, CD Numancia and most recently Cultural Leonesa.

Guillermo's notable achievements include scoring a goal in the UEFA Champions League group stage against FC Porto, scoring decisive goals in La Liga and the Copa del Rey, and playing a key role in CD Numancia's successful campaigns in the Segunda División. Fernandez has consistently demonstrated his skills on the field with his ability to adapt and perform in different attacking roles.

Expressing his delight on joining the Highlanders, Guillermo said, "I am very excited to work with the team and the coaching staff. The club has shown confidence in me and I am looking forward to repaying them and making my mark in the Indian Super League." "Ready for it." ,

His experience in Spain's top leagues brings valuable expertise to NorthEast United FC, strengthening the team's attacking lineup. The club is optimistic about Guillermo's impact in the upcoming season.

"Guillermo is a very experienced professional; his career says it all. He will give us a much-needed boost in our attack and we are delighted to have him here." NorthEast United FC CEO Mandar Tamhane shared his thoughts on the signing, saying, "We feel we have found the right player for our team. Guillermo has played at the top level of football in Europe, his expertise will not only help us will not only strengthen the attack but will also serve as a catalyst for growth and development for our entire team,” said head coach Juan Pedro Benali.