Cooper has been a mainstay at Elland Road since joining Leeds in the summer of 2014 and saw his perseverance at the club rewarded by promotion to the Premier League in the 2019/20 season.
In his first campaign in the Premier League, Cooper made 25 appearances and aided his side in finishing in the top half of the table.
Caldwell insisted that playing in the Premier League requires a higher standard of play than the Scottish Premiership or the Championship.
He stressed that playing in the Premier League week-in and week-out will undoubtedly help Cooper when playing for Scotland as he will be used to the high level of competition.
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