"What we need at Chelsea is consistency," said Ballack. "There is not much that we need to change to win the Premier League next season. We have a great team but we have to change the manager again and we will need a bit of time to adapt.
"I don't think we need to buy anybody because we already have a lot of good players on the bench.
"If you look at the performances over the last couple of years in reaching finals we have a really good squad and are heading in the right direction."