Houston has been dropped from the 2015 Verizon IndyCar Series schedule, it was announced on Friday.

In a press release from the IndyCar management, it was stated that the series and officials from the Grand Prix of Houston had been unable to define a date for the 2015 event.

"IndyCar is thankful to Mike Lanigan and his team for all their hard work and for the tremendous support of the Grand Prix of Houston that we received from Shell, Pennzoil and Honda," said Mark Miles, CEO of IndyCar's parent company Hulman & Co.

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"We look forward to a continued relationship with Mi-Jack Promotions and will always keep our options open when it comes to an important market like Houston," Mile added.

The Grand Prix of Houston had previously been a part of the IndyCar schedule from 1998-2001 and 2006-07, and returned to the schedule line-up again in 2013 which saw it host one of the three double-header events of that season. Scott Dixon won the first race, while the second went to Will Power.

The second race also saw a major accident on its final lap which ended up with Dario Franchitti flying into the catchfence. The four-time series champion was forced to retire from racing as a result of the injuries he sustained.

The 1.7-mile temporary circuit at NRG Park returned to the schedule in 2014, with Carlos Huertas emerging as the shock winner of the Saturday race through a daring fuel strategy gambit, and Simon Pagenaud dominating the Sunday round.

The 2015 IndyCar schedule is yet to be unveiled, but earlier this week it was confirmed that a new Indy Grand Prix of Louisiana would make its bow on the weekend of April 10-12.

The new event will be held at on a newly-configured 13-turn, 2.67-mile permanent road course layout at NOLA Motorsports Park located 14 miles southwest of downtown New Orleans.