Johnson, 27, has been with four teams in four seasons after being drafted in the second round by the Kings in 2012. He signed two 10-day contracts last season, one with the Suns in February and one with the Pelicans in March. He appeared in two games with Phoenix and five with New Orleans.
Milwaukee, which recently added free agent Jason Terry and re-signed Steve Novak, has 15 players with guaranteed contracts. However, Scotto says the Bucks are still looking for ways to improve their depth at the wing position.