Wayne Rooney took a cheeky swipe at Liverpool's attacking trio while comparing them to Manchester United's previous stars.
Roberto Firmino, Sadio Mane and Mohamed Salah have impressed for the Reds, scoring 56 goals between them.
During Sky Sports' Monday Night Football show, on which Rooney was a guest, the trio were compared to United's former attacking lineup of Cristiano Ronaldo, Carlos Tevez and the ex-England captain.
Those three stars won the Premier League title and Champions League trophy during their time together in Sir Alex Ferguson's team, while Liverpool's trio are yet to win silverware at Anfield.
During the discussion, Rooney said: "I think they are very dangerous. Firmino works very hard to win the ball back and they have a lot of pace. As good as they are, Salah takes them to the next level.
"Alex Ferguson used to let us attack how we wanted but if you're on the wing, you had to track back on the wing. We had a good compromise because me and Tevez would do a lot more work defensively than Cristiano.
"But with Cristiano, you knew he would win us those big games with the big moments. With any other player, you probably wouldn't but with Cristiano, he was that good you had to accommodate him. I would gladly do that for him to score big goals and help us win trophies."
When asked if Liverpool's forward players could emulate United's trio, the Everton striker said: "I think it would be difficult. The difference we had is Premier League winners' medals.
"We had real quality behind us and the defence was solid. For them three to get to the level we were at, they need that wall behind them."
Rooney won 12 trophies during his 13-year spell at United.
