Both Arsenal and Chelsea made it through to the Europa League final on Thursday night, but who starred for the London clubs? When is the Europa League final?Chelsea ratings – by Blake WeltonChelsea vs Eintracht Frankfurt reportKepa Arrizabalaga – 8Couldn’t do much for Frankfurt’s goal but pulled out the big stops when called upon in normal time – the best a stunning one-handed save to thwart Danny da Costa’s volley. And spot-kicks offered a Carabao Cup redemption for the keeper which he expertly took – saving well from both Martin Hinteregger and Goncalo Paciencia.Andreas Christensen – 6Appeared to pick up a knock early on and was caught out for Frankfurt’s equaliser early in the second period.Was then forced off with another knock after the interval and really needs to toughen up if he is going to make the central defence his own at Stamford Bridge.Cesar Azpilicueta – 6Chelsea’s captain was having another reliable performance at right-back before being forced into the heart of defence with Christensen’s injury.Looked out of sorts with the change and lucky to remain on the pitch after fouls on Mijat Gacinovic and Jonathan de Guzman as well as missing from the spot in the shoot-out. David…