He is now working with the ball on the Bodymoor Heath pitches individually. Buendia suffered the injury in preseason.
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He said in January: "The greatest moment of satisfaction I have felt in all these months? There are many, but I will stick with a recent one. I went to the doctor's office and saw that my knee moved like a normal knee.
"I didn't feel any kind of discomfort. It was one more step in that return to normality."