Newcastle United do not know if AC Milan were aware of the betting charges facing Sandro Tonali when they sold him to the Magpies this summer, according to sporting director Dan Ashworth.
The 23-year-old midfielder joined for £55m in July, but less than four months later was given a 10-month ban by the Italian Football Federation for betting on matches involving his two previous clubs, Milan and Brescia.
"It's really difficult for me to get into what other clubs do or don't know," Ashworth said.
"All we can do is look at our own internal investigation and internal process.