It was a really bad day at the office for Raheem Sterling and Chelsea yesterday. Chelsea lost the first leg of their Carabao Cup semi-final tie against Middlesbrough 1-0, giving themselves a lot of work to do in the return fixture. Raheem Sterling started the game but was unable to inspire his side to victory and having also failed to score, it means he has now not netted in his last 21 semi-final appearances for club and country. The England winger can obviously put an end to that when Chelsea take on Middlesbrough in the second leg later this month. Overall, Sterling is not having a terrible…