The league chief held a question and answer session on Twitter while in Kansas City for the MLS All-Stars game this week and was asked how the potential expansion of the Lions was tracking.
Garber responded with: "They are one of many potential ownership groups here in KC this week.
"Impressed with incredible turnout for the club and strong ownership..."
"Miami remains a potential new market. Need to ensure we have strong ownership, stadium and biz plan in place before proceeding," he replied.