The Uruguayan completed his 10-match ban for biting Chelsea defender Branislav Ivanovic by sitting out Brendan Rodgers' team's 1-0 defeat to Southampton at Anfield on Saturday.
And, while Rodgers has insisted a decision on Suarez's participation in the cup is yet to be made, he claimed the 26-year-old will be ready to play should he be called upon.
"It has been a really difficult time for him not playing games," he said. "How he has prepared himself over the last number of weeks has been fantastic.
"He's really chomping at the bit to help the team. Everyone knows the depth of his quality and his attitude. Once he gets back on the field again he will show what he has shown since he's been here."
United's ability to call on their main goal threat is shrouded in doubt, however, after Robin van Persie missed Sunday's 4-1 defeat to Manchester City with a groin injury.
These teams have met on four occasions in this competition in the past – two of them in finals – with Liverpool boasting a superior record having won three of those.
