But the Brazilian has promised to devote any success to the battered defender.
Van Dijk suffered anterior cruciate ligament injuries in the Merseyside derby against Everton and could miss the remainder of the season after undergoing surgery.
And while the 29-year-old was pictured returning to AXA training center for rehabilitation, Firmino admitted his teammates were in “unusual” territory after a series of physical setbacks.
He said: “Virgil van Dijk’s injury was a real shame as he is not only an important player on the pitch for us, but also in the dressing room.
“We miss him of course and the team wants to dedicate to him the successes we have achieved in this campaign.
“I think we’ve shown that we have a great team of players, so our goal remains the same.
“It is true, of course, that this season is very unusual. You can’t ignore this because of the missing players with the coronavirus and in our case with injuries too.
“I think it will dramatically improve the competition for the rest of the season and make it even more difficult to win the title.
“But our challenge is to be champions again. So we need to keep our options open at the top of the table and be ready for a long campaign. ”
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Firmino added: “What we are going through now, and what we went through at the end of last season, is different from any situation that we have been through before.
“The healthiest team, in every way, and the most consistent team might just be the one with the best chance of being the champion.
“But we’ll do whatever we can to make sure it’s us. Winning the Premier League twice in a row would be the fulfillment of a dream since I arrived here.
“First it was the Champions League, then the Premier League and now I want another one. Everybody is the same. ”