LONDON (AP) — Chelsea striker Joao Pedro was ruled out for several weeks on Tuesday because of a thigh problem, handing an opportunity for summer signing Emmanuel Emegha to show his worth on his return from injury.Pedro's absence could be significant for Chelsea, which struggled for its usual attacking fluency in the two Premier League games the Brazil international has missed this season — a 2-0 home loss to Spurs on Saturday and a 3-0 loss at Brentford last month.