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Thomas Tuchel was delighted to complete the signing of Raheem Sterling from Manchester City but says Chelsea must continue to bring in "top quality" to compete for the Premier League.

The Blues sealed a £47.5m deal on Wednesday to add Sterling to their squad and, speaking with Sky Sports News, Tuchel described himself as "super happy", explaining that the England forward would be a "big improvement" to the Chelsea squad.

The London club are also closing in on the capture of Kalidou Koulibaly, with the Napoli centre-back in the capital for his medical after the clubs agreed on a fee around £32m.

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