Ross Barkley dedicated his winning goal to Aston Villa's medical staff as Dean Smith's side maintained their 100% start to the season by edging victory at Leicester.
The game looked set to be the first goalless match of the campaign, but Barkley finished incisively into the bottom corner to give Villa all three points and send them second in the Premier League.
Villa have won their opening four top-flight games for the first time in 90 years.
Barkley joined Villa on loan from Chelsea in the summer and has been impressive for the West Midlands club, with the goal his second in as many games.