Maria Sharapova has been tipped to play for at least another three years. The former world No.1 is set to return from a doping suspension in Stuttgart next month, the day her 15-month ban comes to an end. Sharapova hasn't been involved in a competitive match since the Australian Open in January 2016. But manager Max Eisenbud believes the ban could extend the Russian's playing career. 'I watched her practice last week and I was like, it's a joke just how motivated and how good she was,' Eisenbud told CNN. "If (the ban) didn't happen, this probably would have been her last year. I think she'll play through Tokyo [2020 Olympics]." Sharapova has been given wildcards into Stuttgart and the Madrid and Italian Opens. She will need another one to get into the draw at the French Open.