Broadcaster ITV said it expected net advertising to jump by around 15% in June as viewers tune in for the soccer World Cup, after it reported first-quarter trading in line with forecasts. 

Net advertising revenue was down 15% in April and is forecast to be flat in May before an expected jump of 15% in June as the month-long World Cup kicks off on ITV on June 14. 

The company, which is in the middle of a strategic review under new CEO Carolyn McCall, said that while the economic environment remained uncertain, online advertising was growing strongly. 

"We expect ITV total advertising to be up 2% over the first half, but profits will reflect the timing of the football World Cup," McCall said before ITV's annual shareholder meeting later today. 

"Over the full year we are on track to deliver double digit growth in online revenue and good organic revenue growth in ITV Studios," she added.

ITV, under former boss Adam Crozier, rebuilt its business to grow revenues from online services and programme production to reduce its reliance on volatile advertising. 

Under McCall, the group wants to improve the way it sells its shows to other platforms to grow those revenues further. 

McCall said that a "strategic refresh" was progressing well and she would provide investors with an update at the group's half-year results in July. 

The former boss of EasyJet McCall has said ITV creates great shows in a market where broadcasters and online players such as Netflix are battling for content. 

But she has said it needs to make sure it is paid the appropriate amount by platforms for its content made by its studios. 

Analysts have welcomed the new focus but the shares are still highly sensitive to any change in advertising trends. Net ad revenue fell 5% in 2017.