Clayton Blackmore has called on Manchester United to take the initiative against Liverpool on Sunday and attack Jurgen Klopp's team in their Premier League clash.
United beat Fulham 4-1 on Saturday at Old Trafford to snap a four-game run without a win in the Premier League.
But the Red Devils remain sixth in the table and eight points off Champions League qualification, the target manager Jose Mourinho has publicly set for his team.
The Portuguese will head to Anfield on Sunday hoping to end Liverpool's run without a home defeat in the league that stretches back to April 2017.
"We've got pace in the team and we can't let teams play. That's the problem with United," Blackmore told Ian Stone's Comedy Breakfast (weekdays 6.30am-10.30am).
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"They're letting teams play out too easy and you've got to work hard as a team. The top three or four teams in the league work their socks off without the ball.
"That's the only difference because you can attack more then as well. In the Newcastle game we were 2-0 down and then in 45 minutes we scored three goals.
"We hadn't scored three in any other games and that's the way forward for me.
"I know they play a bit of a 4-3-3 but I think we could still go 4-4-2. It's always been a good system at United for 30 years.
"Results change everything and hopefully [the win over Fulham] changes it.
"The shape - 4-4-2 - looks so much easier for players to work with. If you lose the ball, you can get back into the shape easier.
"I look at our shape sometimes and we seem to be all over the place when we lose the ball.
"What we're not doing is closing the ball down quick enough.
"We're letting teams play and they're just running the length of the pitch against us."
Striker Romelu Lukaku got on the scoresheet to his Old Trafford scoring drought while Marcus Rashford produced one of his best performances in a Manchester United shirt.
But Blackmore believes those are two of the players Mourinho should try to rest in the run-up to the Liverpool clash.
"We don't need to win in midweek so we're in a position where we can rest a few players," Blackmore added.
"I watched the game last season at Anfield and I just hope this one is a proper game. Last year was a terrible game, nothing happened and it was a non-event.
"What you want to see is a good game. You've got two good footballing teams so let's see a good game of football.
"I'd like to see us go out there and have a go at them. We got a result there, we drew, and not many teams went to Liverpool last year and got a result.
"So it depends what you want but sometimes you've got to risk it to try and win."