Catkic was taken into police custody as part of the investigation into the group led by the US-based Islamic preacher Fethullah Gulen, it said.
He is accused of downloading and sending messages through the Bylock messaging app which authorities suspect was used by Gulen's supporters to coordinate the July 15, 2016, coup, Dogan said. Gulen denies involvement in the plot.
Catkic was taken to Istanbul police headquarters for questioning. According to the Sabah newspaper, his home was also searched.
Over 50,000 people are being held under arrest in the wake of the coup, a crackdown that has caused international controversy.
The crackdown has also touched football, with the authorities issuing an arrest warrant for former star Hakan Sukur, who played a key role in Turkey's glorious run to third place in the 2002 World Cup. Catkic was also in that squad.
Sukur, also a former stalwart for Galatasaray, is now based in the United States.
Former international footballer Bekir Irtegun, who played 10 times for Turkey, was detained last month on similar charges but then freed, though he remains barred from leaving the country.
Disclaimer: No Business Standard Journalist was involved in creation of this content
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
