Defeat at Brentford was a fourth on the bounce for Reds, leaving them sitting sixth on the Premier League table.
Speaking on his personal podcast, Rooney said: "No-one has seen this coming, it's hit them quick, it's hit them hard and I think they're struggling to find a way out of it.
"This is a time where the manager and the leaders in the team need to figure it out very quickly.
"Virgil van Dijk and Mohamed Salah, they've signed new deals but I don't think they've really led that team this season.
"I think body language tells you a lot, and I think we're seeing slightly different body language from the two of them. They are the top two players in that team and if their body language is not right, that affects everyone else.
"I might be wrong on this, but if I was a Liverpool fan or the manager, that would be a big concern for me."