Former Liverpool defender Jan Kromkamp has re-ignited the controversy surrounding the rotation policy favoured by Reds boss Rafael Benitez.
Kromkamp returns to Anfield with PSV Eindhoven for the Champions League game inisisting regular first-team football has improved his game.
He told BBC Sport: "I wasn't that fit and mentally sharp because I didn't play every week.
"If you don't play that often, it's difficult to remain at a high level."
Benitez has been criticised for tinkering with his team, with the Spanish coach recently ending a run of 99 games without naming the same XI for consecutive matches.
Liverpool director Noel White recently resigned after criticising Benitez's selection policy.
"I am happy that I'm playing football every week"
"I don't know how the players at Liverpool find it but for me it is better to play every week, although I can understand the thoughts that Benitez has about rotation."
The 26-year-old joined Liverpool in January 2006 but only started eight games while coming on as a substitute 10 times during his time at Anfield.
"I did play my games and was happy," he added. "But when I was playing I could notice that I wasn't that fit and mentally sharp because I didn't play every week. From that point of view it was very difficult.
"I enjoyed it very much in England but, overall, it is better for me to be playing more games - that's why I'm at PSV and, let's face it, we are doing great.
"Everything is going very well in Eindhoven. I am happy to be at PSV because I'm playing more now and that is very important for my rhythm.
"I can still improve a lot more but basically I am happy that I am playing every week. That is the main thing."
PSV are top of the Dutch league and, along with Liverpool, are already through to the next stage of the Champions League with two games to play.
Kromkamp says victory against the Reds on Wednesday and the chance to finish top of their group is now the incentive as it could set up a potentially easier match in the knockout stages of the competition.
Liverpool will welcome the distraction of a Champions League tie after the Premiership draw against Middlesbrough still left them without an away win in the league this season.
They are 10th in the top-flight but Kromkamp has backed the Merseyside team to rise up the table.
"I know that they have got a very good team, technical staff and a very good coach in Rafael Benitez," he added.
"What I can remember of last season is that they also did not start very well but at the end they did very well.
"The only thing they can do is improve as they have a very good squad. I think they will get their points but they need a little bit of luck."