The move marks an unlikely return to the Istanbul club for the 26-year-old, two years after he left without ever playing a game following a match-fixing scandal.
Emenike had been accused by authorities of faking an injury in May 2011 when at Karabukspor, ruling him out of a match against Fenerbahce, with whom he signed a four-year deal a few days later.
Amid the scandal, Emenike quit Turkey for Moscow without ever turning out for Fenerbahce and although the club's president Aziz Yildirim was sentenced to six years in prison for his role in a wider match-fixing affair, Emenike was acquitted due to lack of evidence in April, paving the way for his return.
The club from Tatarstan, back-to-back Russian champions in 2008 and 2009, said the 22-year-old will arrive in Kazan on Wednesday night.
Last season's cup winners Kazan currently sit eighth in the Russian Premier League after four matches, four points behind leaders Spartak Moscow.
Tunisian striker set for Marseille switch, Sougou moves other way
Last year's Ligue 1 runners-up Marseille have agreed a deal in principle for Evian's Tunisian forward Saber Khlifa.
The move, subject to a medical, would see Khlifa become the fourth recruit to arrive at the Stade Velodrome this off-season.
Khlifa, 26, netted 13 goals last season as Evian narrowly avoided relegation from the top flight and reached the final of the French Cup, losing 3-2 to Bordeaux.
Meanwhile, Senegalese international Modou Sougou will move in the opposite direction with the 28-year-old joining Evian on a season-long loan.
Nantes swoop for USA CONCACAF Gold Cup midfielder
USA international Alejandro Bedoya will sign for newly-promoted Nantes following an impressive display in the Americans' triumphant Gold Cup campaign, the eight-time French champions announced.
The 26-year-old midfielder will undergo a medical before signing a three-year deal.
Bedoya was out of contract after spending last season in Sweden with Helsingborgs, whom he joined after leaving Rangers following the Scottish giants demotion to the fourth tier.