Chelsea midfielder Ballack: I improved last season

The 30-year-old struggled to shine after joining the Blues on a free transfer from German giants Bayern Munich last summer.

Ballack said: “It was pretty much as I expected it to be — difficult.

“I went in search of a new challenge and I found one.

“Highs and lows are part of it but it’s good because they help me develop.

“I have not lost any of my strength. In fact, I have developed further while in England.”