So, this gives Garner options with four players at three positions:
Ensberg's day off:
A: Lamb plays first, Huff plays third, Berkman plays right
Lamb's day off:
B: Berkman plays first, Ensberg plays third, Huff plays right
Berkman's day off:
C: Lamb plays first, Ensberg plays third, Huff plays right
Huff's day off:
D. Lamb plays first, Ensberg plays third, Berkman plays right
All of these also keep Lamb away from third base.