Answer
Demba Ba joined Chelsea in 2013, signing a three-and-a-half-year contract with the club. The Senegalese striker had previously played for Newcastle United, where he had scored 29 goals in 58 appearances. Ba made his debut for Chelsea in a 2-0 win over Southampton on 2 February 2013, and scored his first goal for the club in a 2-1 win over Manchester United on 10 March 2013.