He said: "I'll get to know next week when I go back and see the specialist and find out if it's healed OK. I'm working hard every day to keep my strength up as best as possible. I'm aiming to get back as quickly as I can.
"It's always frustrating when you're injured. It's the most frustrating time for a player, but you've got to try and keep involved and support your team-mates."
Lockwood, one of several key players to have been sidelined with injury in recent weeks, had formed a central defensive partnership with Jason Shackell, on loan from Wolves, before his injury and had been handed the skipper's armband after Brian Stock had undergone ankle surgery.