Chelsea completes the signing of Baba from Augsburg.

The Blues have moved to address their need for a left-back by snapping up the 21-year-old Ghana international

Chelsea have completed the signing of Augsburg defender Baba Rahman.

The Premier League champions had been looking for a new left-back following Felipe Luis' return to Atletico Madrid this summer but initially struggled to agree a fee for the 21-year-old Ghana international.

Augsburg chairman Jonas Hoffman stated that the club had no need to sell, claiming that they would not entertain discussing a bid under £14 million (€20m).

As a result, Chelsea increased their offer to £17.5m (€20m) and, although the Bundesliga outfit did not confirm the size of the transfer fee, they did announce on Sunday that Rahman is now on his way to Stamford Bridge.

Official: @babarahmangh leaves #FCA and joins @ChelseaFC! Good luck for your future, #Baba! http://t.co/xCHOZD1Gia pic.twitter.com/mRY0Xc55TL

— FC Augsburg (@FCAugsburg) August 16, 2015

Rahman's signing comes as a timely boost for Chelsea, who have begun the defence of their crown in unconvincing fashion, taking just a single point from their opening two games and manager Jose Mourinho has moved to sure up a defence that has already leaked five goals.

Felipe Luis' departure had left Cesar Azpilicueta as their only option at left-back, with Kurt Zouma was forced to stand-in when the Spanish defender went off injured in the Community Shield defeat to Arsenal earlier this month.