Fikayo Tomori comes in for Andreas Christensen to make his second Chelsea league appearance. The previous was back in May 2016 when he was used as a substitute against Leicester at the Bridge. The 21-year-old defender knows today’s opponents well of course, having played them twice in the Championship last season when on loan at Derby.

Frank Lampard has explained his decision to make the change is due to competition for places and with Tomori training really well, he deserves his chance.With Pedro unavailable due to the hamstring strain he suffered in the warm-up last weekend, Mason Mount is expected to continue in a wider role with Ross Barkley more central. Tammy Abraham, the other goalscorer at Norwich continues up front.Eighteen-year-old Academy midfielder Billy Gilmour is on the bench.Sheffield United also make one change from their previous Premier League game. Oliver McBurnie comes in for David McGoldrick in attack.

Chelsea: Kepa; Azpilicueta (c), Tomori, Zouma, Emerson; Jorginho, Kovacic; Pulisic, Barkley, Mount; Abraham.

Chelsea subs: Caballero, Christensen, Alonso, Gilmour, Willian, Batshuayi, Giroud.

Sheffield United: Henderson; Bashan, Egan, O’Connell; Baldock, Lundstram, Norwood (c), Freeman, Stevens; McBurnie, Robinson.

Sheff Utd subs: Moore, Mousset, Stearman, Osborn, Besic, McGoldrick, Sharp.

The referee is Stuart Attwell.,

Stat recap

Sheffield United are seeking a clean sheet at Stamford Bridge for the first time since October 1922, 31 games ago.The Blues and the Blades meet for the fourth time at Stamford Bridge in the Premier League and first time since 2006/07.Chelsea have lost just one of our last 54 home Premier League games against newly promoted clubs, winning 44. Our defeat came against Bournemouth in December 2015.Chelsea have only lost one of our last 23 home league games (13 wins nine draws), which was against Leicester in December 2018.Tammy Abraham has scored more goals than any other English player in the top two tiers since the start of last season (including the play-offs), with his brace against Norwich last week taking his total to 28.The Blades are winless in their last 11 Premier League away games, drawing two and losing nine.Sheffield United have only won two of their last 22 top-flight matches in London – however, both wins were at Stamford Bridge against Chelsea, in March and October 1992.