Evan Gattis (back) could begin a minor league rehab assignment on Wednesday evening. Gattis will need at least three minor league rehab games before returning to the Braves' active roster, so he can probably be ruled out until early next week. The 27-year-old has been out since late June with a bulging disc in his back. He has a .900 OPS and 16 home runs in 63 games this season for Atlanta.