Chelsea's need for January signings clear as Mauricio Pochettino's side crumble under pressure in Carabao Cup

Chelsea were beaten in one of their most important matches of the season, losing the first leg of the Carabao Cup semi-final to Middlesbrough. 

Hayden Hackney scored the game's only goal, with the only consolation for Chelsea that they have a second leg to come at Stamford Bridge.