The Reds won the first leg 1-0 at the Britannia Stadium and therefore have one foot in the final.
Lovren was injured during the first leg played on January 5 at home and Kloop told Liverpool website he is glad to see Croatian back in training this week.
“After three weeks on the sidelines, he had a full training session with the team,” Klopp told www.liverpoolfc.com.
Liverpool go into this match inspired by a 5-4 win over Norwhich City in their Barclays Premier League (BPL) match at the weekend.
If there is one thing Liverpool have enjoyed doing of late is scoring goals. They have had 22 goals in 20 matches with eight of those coming in two matches against Arsenal and Norwich.
Liverpool have won by identical 1-0 scores in the two matches played against Stoke City this season. Furthermore, the Reds have also been dominant at Anfield winning the last two out of three matches at the venue with the other ending in a barren draw.
Matters have not been made any better for Stoke by the fact that they have had an inconsistent season and crushed 3-0 to Leicester City on Saturday.
The huge loss came despite a dominant performance against Arsenal the previous week and coach Mark Hughes must find a way to keep his side performing positively every week.
The loss to Leicester City means that the Potters have taken just four points out of a possible 12 away in the league and underscores their poor performance on the road which may undermine them at Liverpool on Tuesday.
But with a February 28 Capital One Cup final at Wembley on the cards, anything could happen on Tuesday night.