Liverpool's dramatic 1-0 injury-time win over Aston Villa was overshadowed by an injury scare involving England defender Glen Johnson.
The 25-year-old right-back came off in the 89th minute with a suspected knee injury and left the ground on crutches.
"We don't know, we have to do a scan - maybe he has a problem with his knee," said manager Rafael Benitez.
Johnson has already missed three games with a calf problem as Liverpool have endured an injury-plagued campaign.
Liverpool's winner was scored by Fernando Torres, who has been hampered by a groin injury this season.
Benitez revealed the Spanish striker, whose injury-time winner resulted in him overtaking Roger Hunt as the quickest Liverpool player to reach 50 league goals (in 72 games) for the club, has more recently been troubled by an ankle injury.
"Fernando has had some problems with his ankle more than his groin and he has been working very hard with the fitness coach and the physio," added Benitez.
"It depends on how he feels - in terms of how many games he can play - but against Villa he was OK.
"We will have to assess things and see what happens. We will leave it with him but we need to keep him fit for the remainder of the season. That is the important thing."
Benitez says he is surprised by the furore which has greeted his statement that Liverpool will finish in the top four this season.
The victory over Villa took them to seventh in the Premier League, four points behind Tottenham who are in fourth place.
"What else am I going to say? What other answer can I give? I have to be the first one to believe and I have to make the players believe," he said.
"People say I am putting pressure on them. What else am I supposed to do? I am the manager.
"It is important for us to keep Torres and Gerrard fit.
"If they stay fit and can play in most of the games remaining for us then we have a very good chance."
BBC Sport - Football - Liverpool's Glen Johnson suffers suspected knee injury
The 25-year-old right-back came off in the 89th minute with a suspected knee injury and left the ground on crutches.
"We don't know, we have to do a scan - maybe he has a problem with his knee," said manager Rafael Benitez.
Johnson has already missed three games with a calf problem as Liverpool have endured an injury-plagued campaign.
Liverpool's winner was scored by Fernando Torres, who has been hampered by a groin injury this season.
Benitez revealed the Spanish striker, whose injury-time winner resulted in him overtaking Roger Hunt as the quickest Liverpool player to reach 50 league goals (in 72 games) for the club, has more recently been troubled by an ankle injury.
"Fernando has had some problems with his ankle more than his groin and he has been working very hard with the fitness coach and the physio," added Benitez.
"It depends on how he feels - in terms of how many games he can play - but against Villa he was OK.
"We will have to assess things and see what happens. We will leave it with him but we need to keep him fit for the remainder of the season. That is the important thing."
Benitez says he is surprised by the furore which has greeted his statement that Liverpool will finish in the top four this season.
The victory over Villa took them to seventh in the Premier League, four points behind Tottenham who are in fourth place.
"What else am I going to say? What other answer can I give? I have to be the first one to believe and I have to make the players believe," he said.
"People say I am putting pressure on them. What else am I supposed to do? I am the manager.
"It is important for us to keep Torres and Gerrard fit.
"If they stay fit and can play in most of the games remaining for us then we have a very good chance."
BBC Sport - Football - Liverpool's Glen Johnson suffers suspected knee injury
