Minor blow for Ballack

Leverkusen veteran sidelined briefly with knee problem

Ballack: Short stint out

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Bayer Leverkusen midfielder Michael Ballack will be out of action for several days after aggravating an old injury in his left knee.

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The 34-year-old Germany captain, who was left on the bench in Saturday's 3-0 win at Eintracht Frankfurt, missed Sunday's training but should return by the middle of next week.

"Whether he will be able to be back on Tuesday when the team does their first training sessions of the week depends on the process of the treatment," the club said in a statement.

The former Chelsea and Bayern Munich man had returned to action only in late January after being out since September with a shinbone injury.

Ballack, who also missed the World Cup last year through injury and is battling to win back a place in the national side, was surprisingly left on the bench on Saturday after spending 40 minutes warming up in the second half.