WATCH: Retired Tim Duncan still practicing with Spurs

Tim Duncan just can't stay away.

The Spurs great retired after last season, but he is still at practice helping his former teammates.

Duncan vs Gasol in practice #Spurs pic.twitter.com/dEhhg008iP
— Jabari Young (@JabariJYoung) December 12, 2016

What a #Spurs practice looks like in more than a month.... of course it includes Tim Duncan pic.twitter.com/6hPLaOggdl
— Jabari Young (@JabariJYoung) December 12, 2016

Pau Gasol vs Tim Duncan at practice today #GoSpursGo pic.twitter.com/KQUT1NFt5I
— Hannah Trippett (@Hannah_Trippett) December 12, 2016

Gasol on playing Tim Duncan 1-on-1... #Spurs pic.twitter.com/1nQlGgKZMr
— Jabari Young (@JabariJYoung) December 12, 2016

Duncan's No. 21 jersey will be retired in a postgame ceremony on Sunday.