This is encouraging: Matsui is making good progress:

Matsui also has been playing catch in the outfield during batting practice, though he can only catch balls that are lobbed to him; he isn't allowed to shag fly balls yet. Matsui is targeting an August return, which would be ahead of the September prognosis he received right after his injury. "If it turns out to be that, that's fine," Joe Torre said. "We certainly hope it is."

The same article mentions that Sheffield should be back before September as well. Just in time, it seems.

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