According to the National Football Post's Aaron Wilson, the Colts worked out Greene recently, while Greene has also worked out for the Houston Texans, Cleveland Browns, Philadelphia Eagles, and San Francisco 49ers, along with visits with the Minnesota Vikings and San Diego Chargers.
Greene was a three-year starter at right guard for San Diego State. He started 25 consecutive games in 2013 and 2014, but he was suspended for the first six games of the 2015 season by his coach for a positive marijuana test. After serving the suspension, he came back and started the final seven games of the season at right guard. He was an Honorable Mention All-Mountain West selection in 2014, and he proved to have talent at the guard position. The thing that NFL teams will want to know more about, however, is his failed drug test, but his talent could cause a team to select him on day three of the draft.
The Colts will be looking to address the interior of their offensive line in the draft, so it makes sense to work out a guy like Darrell Greene. He will likely be a late round pick, but he does have plenty of collegiate experience at guard and does have talent to play along the interior, enough so to make teams interested in him despite his failed drug test. It's likely that some team will take him in the draft, but it remains to be seen whether that team is the Indianapolis Colts.