The Welsh side won promotion to the Premier League last season as Warnock guided the Bluebirds to a second-place finish, concluding the season with an impressive 90 points.
And as Warnock is looking to strengthen his defensive options ahead of a difficult campaign in the top-flight, the 69-year-old has added to his ranks by signing one of his former goalkeepers.
28-year-old Smithies, who has experienced promotion to the Sky Bet Championship in 2012 with Huddersfield Town, has signed a deal tying him to the Bluebirds until 2021.
Smithies scored the winning penalty for his boyhood club, Huddersfield Town, in the Terriers’ play-off final in 2012. Having begun his career with the Yorkshire outfit, Smithies went on to make 275 appearances for the Terriers.
In August 2015 Smithies made the move to QPR, with whom he made 109 appearances. During an extended time at Loftus Road, the talented shot-stopper won the Hoops’ Supporters’ and Players’ Player of the Season awards in 2016/17.
Speaking after completing the signing of Smithies, Bluebirds boss Neil Warnock spoke of his delight at signing his former goalkeeper.
“I wondered if he just has a blinder when he plays against us,” he said to the Club Website. “But having watched Alex for a while, there is no doubting his pedigree.
“He’s a lad that knows he will have to fight for his place. Neil Etheridge had a fabulous season in 2017/18 and improved as time went on. It’s great for us to have that healthy competition.”