The sites -- liverpoolfc.tv, itv-football.co.uk, itv-f1.com and arsenal.co.uk -- reach 21m users a year and are expected to revamped in July and August of this year.
Lastminute.com will provide a range of sport-related travel and entertainment offers. Sports fans logging on to the sites will be able to buy hospitality packages and last-minute tickets to games and events, such as the British Grand Prix.
The sites will be jointly promoted by Lastminute.com and Granada Broadband, and there will be monthly competitions giving sports fans the chance to see the biggest sporting events of the season.