After six defeats in 14 Premier League matches, the Reds sit ninth, struggling for form across all competitions, including defeats to PSV and Crystal Palace recently.
Last season’s Player of the Year Mohamed Salah, has scored just four goals in 13 league games and been dropped for recent matches.
Van Dijk urged the Egyptian to rediscover his form and lead the team forward.
"It's not like you have unlimited credit, everyone has to perform. Mo has been doing that but the manager made that decision in the last two games,” Van Dijk told the media.
“We all want the best for the club. I am pretty sure Mo will still be a big part of what we are trying to achieve because he is an amazing player and he has shown it consistently.
“But we are all trying to find consistency and he needs us to be in our best shape and we need him and that's what we are all trying to find."
He added: "He is still a fantastic player and we still have to remember there is a reason why he has been so successful at the club and we have to respect that.
“I need him around as one of the leaders. I'm not worried. He's disappointed but that's absolutely normal as if you're not disappointed when you're not playing two games in a row then there is an issue as well."