Chelsea's failure to qualify for Europe will help them become "a real threat" in the Premier League next season, says former Manchester United and England striker Wayne Rooney. A 2-1 defeat at Sunderland on Sunday brought down the curtain on a disappointing season for the Blues, who have sacked Enzo Maresca and Liam Rosenior along the way. Chelsea, who started the day above Sunderland in eighth, slipped to 10th, to also finish a point and two spots behind Brighton, who qualified for the Conference League.
