ISIS threatens to behead Lionel Messi and Cristiano Ronaldo in sick boast ahead of World Cup in Russia

ISIS has threatened to behead star footballers Lionel Messi and Cristiano Ronaldo at the World Cup in Russia.

The Islamic extremists have already made several threats about the tournament, which kicks off next month, but the latest propaganda is the sickest so far.

The Islamic State is increasing its calls for 'lone attackers' to strike as the terror group loses ground in Syria and Iraq.

Barcelona star Messi has been pictured as part of ISIS threats before but now terrorists have vowed to behead the record goalscorer.

Both he and Real Madrid forward Cristiano Ronaldo - the two best footballers in the world - are seen pinned to the ground with their heads being hacked off in a packed football stadium by masked jihadi fighters.

ISIS is desperate to strike at the World Cup (Image: Picture: SITE)

Messi and Ronaldo have been targeted by ISIS (Image: AFP/Getty)