Emi Buendia is struggling to replace Jack Grealish, John Terry is a big loss... and Wolves collapse spooked them: Where it's all gone wrong at Aston Villa as they look to avoid a fifth straight defeat and save Dean Smith's job

Dean Smith faces perhaps the defining moment of his three years as Aston Villa manager when they take on Southampton on Friday night.

Defeat would be Villa's fifth in a row and would leave Smith at risk of losing his job before Villa's next game, against Brighton on November 15.

Here Sportsmail looks at what is behind the Villa wobble.

Aston Villa captain Jack Grealish was snapped up by Manchester City - he has been a big loss

Departure of Jack Grealish

Villa used the £100million Manchester City paid them for Grealish to buy Emiliano Buendia, Danny Ings and Leon Bailey but they have yet to fill the void left by their former captain.