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Costa: Is his body going to break down like Fernando Torres?
If Costa can stay fit, he should be expected to score 20-30 goals.
Fabregas: One of the best passers in the world, who will be creating shots for Costa.
Luis: A world-class left-back who averaged 4.1 tackles per game last season.
Pasalic: Don't know enough about him. Loaned out to Elche.
Drogba: Will be an upgrade over Torres.
Bertrand: "It is understood the deal could be worth up to £10 million, should Southampton choose to make the move for Bertrand a permanent one," per The Guardian.
Easy money for Chelsea if Bertrand plays well at Southampton.
Piazon: Do Chelsea view him as an asset or a future first-teamer?
Pasalic: Elche tend to give loanees extended runs in the first-team, so if Pasalic is top-flight quality, he will receive opportunities.
Kalas: His development stalled last season, so loan to Koln is a welcomed move.
Hazard: Gladbach have one of the best squads in the Bundesliga, so it will be surprising if Hazard becomes one of their most important players.
Summary: With this outstanding squad, Jose Mourinho has to win the Premier League and make a deep run in the UEFA Champions League.