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Harvey Elliott, who joined from Liverpool on a season-long loan on transfer deadline day, put Villa ahead in the 43rd minute, his side's first goal of the season.

Aaron Hickey's first goal for Brentford levelled the tie in the 57th minute although Villa will feel it should have spared itself penalties by winning in normal time.

As it was the host won 4-2 on penalties as keeper Hakon Valdimarsson saved spot kicks from John McGinn and Matty Cash.

Crystal Palace also needed penalties to get past second-tier London rival Millwall for whom Ryan Leonard scored a last-minute equaliser in a 1-1 draw at Selhurst Park.

Chris Richards had given Palace the lead.

Fourth-tier Grimsby Town, conqueror of Manchester United in the previous round, continued its adventure as it won 1-0 at struggling Championship side Sheffield Wednesday thanks to a headed goal by Jaze Kabia.

Grimsby is in the fourth round for the first time since 2001-2002.