Sources told ESPN that Jimmy Butler and the Miami Heat are moving towards a maximum contract extension worth $184 million over four-years.The Heat and Butler can close the deal in the next week. He'll be able to sign a new deal after Aug. 6, when he will be eligible to extend his original deal with them.He was a key player in the recruitment of Kyle Lowry, point guard free agent, who posted on Instagram that he was joining Heat and knew he would be with them into the future.Butler, 31, just finished an All-NBA season, in which he averaged 21.5 point, 6.9 rebound, 7.1 assists, and a league-best of 2.1 steals per match.