He's someone I know [head coach] David Ripley is looking at, along with one or two others at the moment, Smith told Radio Northampton.My understanding is he doesn't want to play [four-day] county cricket, he wants to play T20. [But] He's likely to have some involvement with the Australia one-day team after the Ashes.Northants had hoped to bring in Johnson's fellow countryman Shaun Marsh as their second overseas T20 player alongside Cameron White, who has already been confirmed for the competition's start in June.Johnson, currently playing for Mumbai in the Indian Premier League, is best known for his quick left-arm bowling, but has shown ability with the bat in the past.However, batsman Marsh turned down an offer from Northants, forcing the club to look elsewhere.Mitchell's a good all-round cricketer. He has a Test hundred and he hits a pretty hard ball in white-ball cricket. We feel the balance of someone of that ilk would be considered.We're following up our next in line," said Smith. "I think most people are aware that with Mitchell Johnson having not been selected for Australia, clearly he has become a candidate for a number of counties for T20.