Under contract at Leipzig until 2020, Werner is set to decide on his future with his club prepared to cash in on him in the upcoming transfer window to stop him entering the final year of his deal.
- Honigstein: Where will Werner end up?
The 22-year-old has been strongly linked with Bayern Munich but asked by the print edition of German outlet Sport Bild what they would advise Werner to do, Mane and Keita both said they hoped to persuade him to move to Anfield.
"We played really well together at Leipzig, and he was one of my best mates," Keita said. "It's clear: Should he move, then I ask Timo to join us here at Liverpool."
Echoing Keita's sentiment, Mane added: "I'd advise him to join Liverpool. I like his style of play. Very forceful, good finish, always giving it 100 percent. If he wants to join us, we'd welcome him to our team.
"When it was clear that Naby would join us, I often watched Leipzig matches. But to be honest: It was dreadful for me at the start. Naby saw quite a few red cards. I then asked Kevin Kampl, my friend from our time at RB Salzburg, why Naby always got sent off. He didn't know. Naby missed some important games and I could watch other players more closely. And Timo stood out."
Meanwhile, Michael Owen believes Liverpool may have trouble recruiting a world-class attacker in the peak of their career this summer.
Owen feels potential targets may be put off from signing at Anfield due to the quality the club already possess in the final third.
"It's so much easier if you're a scout or in the recruitment department of any club bar the top six," the former Ballon d'Or winner said. "How do you recruit someone and they say, 'Well, am I going to start?', and you say: 'No, Salah is going to start'?
"You can't go and get an absolute top-liner, unless they've only got a couple of seasons left in their career. Or you go and buy the next really good young thing and maybe almost bleed him in for a year or so. But to go and get someone in the guts of their career at 24, 25 that's at the top of the tree, it's so hard. That's the only type of player that can improve teams if they're world class."
In reserve to their starting attacking options, Liverpool currently have strikers Divock Origi and Daniel Sturridge -- both of whom could leave the club in the summer.
"[For] the top six, it's really hard to go and get someone who is going to improve your team," Owen, speaking to promote the LFC Foundation Legends match with AC Milan on March 23, added. "Unless you're not happy with one of your players in your team and you go and replace them with a world-class player, then of course.
"But Liverpool have got a great front three, so if they're going to buy then you'd think it would be one of the options that I've just mentioned."