Liverpool are currently chasing their first top-flight title since 1990 but are in second place, three points behind Manchester United, who also have a game in hand.
Liverpool launched an unsuccessful bid for England midfielder Barry last season but were unwilling to meet Villa's reported £18m valuation.
The 28-year-old said he wanted to move to Anfield but in the end he remained with Villa, the club he joined as a youngster and the only one has played for.
Spain and Valencia striker David Villa, 27, was the top scorer at Euro 2008, while 24-year-old England defender Johnson has rediscovered his best form since moving from Chelsea to Portsmouth in 2007.
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