The 30-year-old missed England's World Cup qualifying double-header with Slovenia and Lithuania due to struggles with a hip injury and had been a doubt for the visit of the Baggies.
"Jamie Vardy has fully recovered from his hip problem. He had the injections straight after the Bournemouth game. He was given a bit of time away because he wasn't able to do anything. But he has trained fully this week every day and he has looked sharp. I am really pleased to report there are no ill effects from that. Going forward for us and the national team, if selected, he is back," he told reporters.
"It is always a strange week international week but playing Monday has helped us this time in terms of getting everyone back and getting a clean bill of health. There was a scare about Wilfred Ndidi but it was only cramp. He trained today (Thursday) fully. He is fine, no problems there.
"Ben [Chilwell] has trained today. He was a concern. It was against Liverpool when he took a dead leg. It was a swelling on the knee, which they took a precaution on, and I am grateful to England for doing that. He has been working indoors but has trained fully today. He is available for Monday. All the internationals have returned with a good clean bill of health. In terms of injuries, Robert Huth and Matty James are longer term and won't be available for Monday."
Leicester currently sit one place above the relegation zone, having won just one of their opening seven matches.