A 5,500-capacity amphitheatre and indoor training facility has been designed by Populous for National Football League (NFL) franchise the Jacksonville Jaguars.

Located at the south end of the Jaguars’ EverBank Field stadium, the amphitheatre and training facility – named Flex Field – will be housed under one roof. The amphitheatre can host concerts and events, while Flex Field will also be used for additional fan entertainment on game days.

According to Jacksonville-based publications First Coast News, site preparation for the project may begin next month.

The development was approved by Jacksonville City Council in December last year, and the local authority will pay US$45m (£63.9m, €80.6m) of the US$90m (£31.9m, €40.3m) outlay for the facilities, with the Jaguars paying the rest.

In addition, the private box areas – named the US Assure Club after its commercial sponsor – of EverBank Field will also be improved with the installation of a glass wall between the upper and lower clubs, and the installation of “the world’s largest video board”.

“We want to thrive and be respected,” said Jaguars owner Shahid Khan. “We shouldn’t be satisfied with where the Jaguars are commonly associated as a member team of the NFL. We have a vision to share on how to get that done so that we have a franchise that is not only stable here in Jacksonville, but also promising.”