Romelu Lukaku is in 'frightening' form ahead of his return to Chelsea, according to team-mate Ashley Williams.
The Everton striker netted his seventh Premier League goal of the season in Sunday's 2-0 win over West Ham, making him the division's joint-second highest scorer.
And Williams believes Lukaku recent performances should have Gary Cahill and Co worried in Saturday's evening kick-off.
Speaking about Lukaku's display against Slaven Bilic's side, in which the Belgian also provided an assist for Ross Barkley, Williams told the Liverpool Echo: 'I thought it was one of his best games since I've been here and he was unplayable at times.