According to Romano, Arsenal winger Trossard will join Besiktas from Arsenal. 

Romano:

🚨⚪️⚫️ BREAKING: Leandro Trossard to Besiktas, here we go! Deal approved right now by Belgian winger.

Arsenal receive €18m plus €2m add-ons as #AFC already accepted terms last week.

Trossard will be in Istanbul tomorrow night for medical and contract signing. 🦅