The 31-year-old striker started his football career in 2001 and signing him means the club will benefit from his 13 years experience, the club announced in a statement here.
"He will be benefiting the NorthEast FC's attack by bringing onboard 13 years of professional football experience," the statement said.
A native of Malaga in Spain, Koke started his career with Malaga before shifting to Marseille in France and then he had a successful run at Sporting Lisbon in Portugal.
"I am very eager to start training with my new teammates and am excited about this new journey. I look forward to a great season and to score some winning goals for my team," Koke was quoted as saying by the club.
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NorthEast FC's coach Ricki Herbert said he is looking forward to the new addition to his team.
"The arrival of Koke at NE United FC is one of excitement and anticipation. His experience and pedigree is much awaited and we all look forward to his appearances as a North East United player," he said.
The club had signed World Cup 2010 and European 2008 Championship Winner-- Spanish Defender Joan Capdevilaas -- as their Marquee player for the inaugural season of Indian Super League scheduled to begin early next month.
The team had also signed Zambian international midfielder, Isaac Chansa, who also won the 2012 African Cup of Nations, along with Lajong FC striker Cornell Glen.
Earlier this month, the club signed Portuguese Defender Miguel Garcia, Zambian Midfielder Kondwani Mtonga and Greek Goalkeeper Alexandros Tzvoras.