Arsenal are seeking a one-year loan deal for Sahin, but are at odds with his current club Real Madrid, over the player's possible destination in 12 months.
The respective managers Arsene Wenger and Jose Mourinho, are both keenly aware that Sahin has the talent to develop into a legitimate star. Although he has struggled for playing time with Real, Mourinho probably doesn't want to give up so easily on a player who only joined Madrid last summer.
That's an understandable perspective, considering Sahin is the kind of player who could flourish after a season under Wenger's tutelage. Technically-gifted and creatively-minded, Sahin specialises in the intricate, attractive style Wenger insists Arsenal play.
No doubt that's the reason Wenger covets the option to secure a permanent move for Sahin, if he enjoys a successful loan-spell. Both managers know what Sahin is capable of, having seen him inspire Borussia Dortmund to the Bundesliga title in 2011.
Yet Madrid's starting midfield berths are currently dominated by the likes of Xabi Alonso and Mesut Ozil. While Arsenal need a player of Sahin's assurance and quality now.