Chelsea take on Leeds United in the FA Cup semi-final this afternoon at Wembley Stadium at a crucial time in the Blues season.And SBK are offering new customers £40 in free bets when you bet £20 on the football.Leeds are actually on a bit of a run in the Premier League now, having distanced themselves and seemingly escaped a late relegation battle.They faced the Blues at Stamford Bridge in February and managed to secure a 2-2 draw thanks to two goals in the second half for a huge comeback.That came despite only having two shots on target against a rampant Chelsea who didn’t make the most of their 20 shots, with only four hitting the target.Chelsea have been on a really poor run of form recently, so much so they’re looking likely to finish outside of the top seven in the Premier League and therefore miss out on a chance at playing in Europe next year.With a 3-0 loss away to Brighton on Tuesday night it doesn’t bode well or make ideal prep work for such a big FA Cup clash on this Sunday afternoon tie.They reached the semi-finals by beating Port Vale 7-0 but have lost to PSG, Everton, Man City and Brighton 3-0 from March onwards.Bet £20 on Chelsea vs Leeds United and get £40 in free bets as a new UK customer to SBKSBK Betting Offer: Bet £20 get £40 in free bets – CLAIM HERE*Remember to gamble responsiblyA responsible gambler is someone who:Establishes time and monetary limits before playingOnly gambles with money they can afford to loseNever chase their lossesDoesn’t gamble if they’re upset, angry or depressedGamcare – www.gamcare.org.ukFind our detailed guide on responsible gambling practices here.For help with a gambling problem, call the National Gambling Helpline on 0808 8020 133 or go to www.gamstop.co.uk to be excluded from all UK-regulated gambling websites.Commercial content notice: Taking one of the bookmaker offers featured in this article may result in a payment to talkSPORT. 18+. T&Cs apply.