According to Saudi newspaper Al-Riyadiya, Al Ittihad have identified the Japan international as a potential successor to Moussa Diaby, whose own return to Bayer Leverkusen has stalled for weeks largely because the Saudi club have yet to find a replacement for him.
Diaby and Leverkusen are already in agreement over personal terms, with a fee of just under €30m under discussion, though Inter Milan had also been monitoring the situation as recently as this week.
Doan is contracted at Eintracht Frankfurt until 2030 and was a clear first-choice player last season, making 40 appearances and contributing 13 goal involvements.
The club signed the left-footed forward from Freiburg for €21m just a year ago, meaning any departure now would represent a significant reshuffling of Frankfurt's attacking options with the window closing in days rather than weeks.
Should Doan's situation move forward, it could unlock the wider chain of transfers connected to it: Leverkusen's pursuit of Diaby has been effectively waiting on Al Ittihad finding a like-for-like replacement, and Doan's profile — pace, technical quality and a left foot suited to cutting in from the flank — has made him an appealing option for the Saudi club as they try to complete their own business before deadline day.
A sale would also carry financial logic for Frankfurt, who could stand to make a profit of close to €9m on a player they signed only twelve months ago, even after factoring in the cost of finding a replacement.
That search would not be straightforward this late in the window, however, and the club would need to move quickly to identify a like-for-like option on the wing if Doan's departure does materialise before Tuesday's deadline.