Juan Pablo Montoya has revealed that he received a "special" phone call this week.
"Frank Williams called me this morning to say hi," the Colombian, who made his formula one debut for Sir Williams' British team in 2001, wrote on his Twitter page.
Now 33, Montoya races in NASCAR, after switching in 2006 mid-way through an acrimonious second season with McLaren.
He indicated his best memories of formula one were with Williams.
Referring to his phone call, Montoya added: "It was very special talking to him again. He is a very nice guy ... and no, I'm not going (back) to F1."