Premise: Chelsea Football Club ( [ ˈtʃɛlsiː ] ) is an English professional football club based in Fulham , London , that competes in the Premier League , of which they are reigning champions . Romelu Lukaku . In the 2011 summer transfer window , Lukaku joined Premier League club Chelsea .
Hypothesis: Romelu Lukaku joined a team during the 2011 summer transfer window.
Label: ENTAILMENT