The Astros designated Davidson for assignment Monday.
Davidson will give up his spot on the 40-man roster to right-hander Luis Garcia (elbow), who was activated from the 60-day injured list ahead of his scheduled start Monday versus the Angels. Since being claimed off waivers from the Athletics in July and getting sent to Triple-A Sugar Land, Davidson is hitting .207 with a 34.4 percent strikeout rate in 22 games.