According to a report from the blog 24/7 Wall Street, seven North American professional teams are "on the brink of collapse".

The Minnesota Timberwolves, Sacramento Kings and Indiana Pacers are the three teams on the list.

The Wolves have lost money in every season but one since 2004. 

Attendance at Kings' games has dropped nearly 20% over the past 10 seasons.

The Pacers have lost $52 million over five years and attendance has declined by over 24%, which represents the second biggest decline in the NBA.