The second half injury to Mohamed Diame was a key factor in Liverpool's 3-2 comeback win at West Ham, Jamie Redknapp told Sky Sports.
A Mark Noble penalty and Steven Gerrard's own goal had cancelled out Glen Johnson's early wonder strike and left Liverpool looking like they were going to return to Merseyside pointless.
However, powerhouse Diame pulled up with a hamstring problem three quarters of the way through the match and within seven minutes Liverpool had taken the lead with a smart Joe Cole finish and an unfortunate James Collins own goal.
"At 2-1 down I couldn't see Liverpool winning this match," said former Reds midfielder Redknapp.
"West Ham were pressing and Liverpool couldn't get their passing going. But once Diame came off and James Tomkins came on, a defender who was playing in midfield, you just felt West Ham lost their way a little bit.
"I'm sure Sam Allardyce points to that as a pivotal moment because once Diame came off they lost that movement and power in midfield. The second goal was a good finish from Joe Cole but Tomkins should have followed his run."
Given the fact Liverpool were operating with Jonjo Shelvey as a lone forward in the absence of the injured Luis Suarez Redknapp believes Liverpool will be delighted to come away from Upton Park with all three points and remain in touch with the Champions League places.
"If you put it into context it's a good win for Liverpool," he said.
"Liverpool's best player wasn't there, Luis Suarez, they were playing without a recognised centre forward and, although Jonjo Shelvey did a good job up there, it's not his natural position.
"It was a tight game but for Liverpool to get that win and be four points behind Everton, who are in fourth place, it was a really big result for them."
And Redknapp expects the victory to inspire the Reds, who have two winnable games up next in the league, with Aston Villa and Fulham travelling to Anfield.
"Next week Luis Suarez is back, they've got Fulham and Aston Villa coming up and they're games they'll believe they can get six points out of," he said.
"That result will give them a lot of confidence. Raheem Sterling at times looked breath-taking. He wasn't in the game enough but you could see the quality he has.
"And when they get Suarez back next week he will give them a different dimension."