Michael Jackson was scheduled to perform a slew of shows in London during the summer, but fans that waited in line to get those tickets, may not be able to see the king of pop.

According to Reuters, a New Jersey based promoter plans to sue Jackson to block him from performing in London this year. AllGood Entertainment Inc claims they have a signed contract that prevents the music icon from performing until July 2010, during a reunion show with his brothers from the Jackson Five and sister Janet Jackson.

Under the agreement, Michael Jackson cannot give another concert until that Jackson Family reunion show, said Patrick Allocco, managing partner at AllGood Entertainment.

The company sent out a cease and desist letter to Jackson's manager Frank DiLeo and concert promoter AEG Live, who have signed Jackson to perform a series of 50 shows at London's 02 Arena starting in July. In the letter, AllGood Entertainment warned that its agreement with DiLeo barred Jackson from performing the London shows.

AEG Live confirmed that AllGood had contacted them, but calls their claims meaning less. A source at AEG said rehearsals in Los Angeles are continuing in preparation for the July shows at the 02.

Patrick Allocco, a partner at AllGood, told Reuters that his company plans to take their case to federal court after numerous failed attempts to negotiate with Jackson in attempts to allow the London shows to go ahead.

"As of right now, we've gotten zero cooperation from anyone, Frank DiLeo refuses to honor our agreement and that's why we're filing a lawsuit by week's end," Allocco said.

AllGood was planning a one-time concert featuring Michael Jackson on July 3, 2010, at Texas Stadium in Irving, Texas. It would be available as a pay-per-view event over the Internet, and could fetch up to $30 million.

However, the London shows could overshadow AllGood's planned event. The series of concerts in London have also been touted as unprecedented. They are expected to garner the biggest audience ever to see an artist in one city.