The former Blues midfielder has hailed the France international's arrival at Stamford Bridge but has warned him he needs to adjust to life under the spotlight week-in week-out
The France international moved to Stamford Bridge for a reported £32 million fee after helping to inspire Leicester to last season's remarkable Premier League title win.
Kante made his full debut in the 2-1 win over West Ham on Monday and was widely praised for his performance, although he was arguably fortunate to escape a second yellow card for a challenge on Dimitri Payet in the closing stages.
Ballack, who won the Premier League and three FA Cups in a fine four-year spell with Chelsea, believes Kante was a shrewd signing by the Blues, but still has plenty to prove.
READ MORE | Chelsea 'set to sign Eduardo'
"Players were underperforming and I think that's why Chelsea made the right decision to buy this player, because he was a key player at Leicester," he told Omnisport.
"Also, when I saw him play for the French team, he reminds me a bit of [Claude] Makelele in his style of play.
"I think he could give that team a solid basis which is necessary for the right balance of the team in terms of offensive and defensive.
"He's the right player, he seems the right player, he's a good buy but still he has to deliver and he has to show that also adapt to a bigger club and bigger expectations which is not easy. But I think on paper it's a good signing."