The Gunners have reportedly "shaken hands" with the Super Lig club on a loan deal for their back-up goalkeeper, who could move on after four seasons in north London, per Fanatik (h/t Football.London's Rob Guest).
Ospina is said to still need convincing, with Guest noting he wants "€4 million a season, while Besiktas are only willing to pay €3 million." Guest also pointed out how Besiktas are keen to replace last year's No. 1, Fabri, who has signed for newly promoted Fulham in the Premier League.
Leno has likely been brought in to win the No. 1 job under new head coach Unai Emery. The latter has replaced Arsene Wenger in the dugout and made refreshing his options between the sticks a priority.
Despite Leno's arrival, the Gunners' regular starter Petr Cech has resisted rumours he will move on.
The 36-year-old reaffirmed his desire to compete for the job to Sky Sports News (h/t Matthew Treadwell of Sky Sports): "I said from the start I want to stay and fight for my place in the team and I will honour my contract, unless the club tells me to go."
Cech made it clear he wants to show Emery he still has the talent play regularly at the highest level. The veteran keeper's agent, Viktor Kolar, also poured cold water on any exit talk involving his client, per ESPN FC's Mattias Karen.
The presence of Leno and Cech naturally increases doubts about Ospina's position. The 29-year-old shouldn't welcome a role as a third-string keeper.
Things were different last season when Wenger trusted Ospina to start in cup competitions. It meant ample playing time for the South American as Arsenal reached the Carabao Cup final and the last four of the UEFA Europa League.
Being the cup goalkeeper could be in Cech's immediate future, while Emery may not even be finished adding to the position. Marca (h/t Sky Sports) recently reported the Gunners were in "advanced talks" over a deal for Borussia Monchengladbach and Switzerland international stopper Yann Sommer.
Moving on, at least temporarily, would be best for both Ospina and Arsenal, as Emery continues to refine and equip his squad for a new era.