City appear to be one of the interested parties to reunite with Germany, with doubts over Gundogan's continuation at Barcelona.
He Manchester City One of the clubs exploring the possibility of signing him Ilke Gundogan Amid doubts about his future Barcelonasources told ESPN.
Including Saudi Arabian clubs Al Nasser Cristiano Ronaldo is also interested GundoganIt may come off Barcelona After one season.
Barcelona coach Hansi Flick wants the 33-year-old Gundogan to stay, but club bosses are willing to let him go if the right offer comes along, a source told ESPN.
Gundogan, who made 51 appearances for the Catalan club last season, has two years remaining on the contract he signed when he left City on a free transfer last summer.
City are considering signing another midfielder after letting Calvin Phillips join Ipswich Town.
The club are also considering adding a striker following the departure of Julian Alvarez to Atletico de Madrid and an injury to Oscar Popp, which could keep the Norway international out for more than three months.
City wanted to keep Gundogan last summer but the German, who announced his international retirement on Monday, rejected several contract offers.
Despite interest from Arsenal, he eventually accepted a transfer to Barcelona. Gundogan left City after making more than 300 appearances in seven years and winning the Premier League title five times.
Gundogan, a key player for Barcelona last season, is under constant pressure following the arrival of Dani Olmo from RB Leipzig this summer.
Meanwhile, despite interest from Al Hilal, City are unlikely to consider offers for captain Kyle Walker, a source has told ESPN.
Walker left the Etihad to join Bayern Munich a year ago but instead signed a deal that will keep him at the club until 2026.
Al Hilal are keen to sign former Nottingham Forest defender Renan Lodi to open up space for another foreign player in their squad, a source has told ESPN.
However, with 10 days to go until the transfer deadline, City are unwilling to lose Walker and any plans are likely to be rejected.