Chelsea boss Roberto di Matteo is excited about his three new midfield signings.
"I am excited by these new players. You look at what they've done at previous clubs, and trying to bring them together to express their qualities for the team will be exciting.
"Marin has been injured for a couple of weeks. Hazard is the type of player with great qualities. He will have to adapt to the English Premier League. Some adapt a bit quicker than others, so we'll have to be patient.
"I watched Oscar in the Olympics, and before the Olympics, and he will certainly add a lot of quality to our team and options.
"I'm also sure that, because he's still a young man, he will be able to learn from the players we have here and the mentality they have.
"We have a very driven team of players and they are never satisfied with what they've done in the past. Oscar is a great player. The good players can always play together.