Groningen technical director Mark-Jan Fledderus said: "We first went to Munich to speak to him about coming to play for us, just days after he retired in May last year.
"That didn't happen. But we kept up contact and then arranged secretly with his wife to travel down and talk to him again last month.
"We ordered sushi from their favorite restaurant and we made a compilation of footage from the documentary 'The Last Dance' and footage of Robben.
"We then said that the best way to help our club was to play football with us."
Speaking of soccer, filthy backheel: