The ex-West Ham United striker has claimed the full-back is just as important to Liverpool as Mohamed Salah is.
Naby Keita opened the scoring for the Reds, before Diogo Jota bagged his first since Liverpool’s 3-3 draw with Brentford.
Salah then went onto score a hat-trick of his own - making it 10 goals in nine Premier League matches this season.
All eyes were on the Egyptian, however McAvennie was quick to heap praise on Liverpool’s Scottish left-back after the match.
Speaking to Football Insider, he said: “I feel like he’s gone a bit under the radar recently.
“People will call me biased and I get that but Andy Robertson, what a player.
“He just hasn’t stopped ever since he signed for Liverpool. Is he the best left-back in the world? Probably.
“What a bargain signing he’s been. Liverpool are such a good unit and he’s a big part of that.
“He might not get the headlines but he’s one of those players who is every bit as important as the Mo Salahs of the team.”
Robertson has made 10 appearances for Liverpool in all competitions this season, chipping in with two assists.
The Scotland international has been regarded as one of the very best in recent years, however his defensive counterpart Trent Alexander-Arnold has received most of the attention during the start of the current campaign.
Konstantinos Tsimikas replaced Robertson for a handful of fixtures earlier in the season when the 27-year-old picked up an injury and while the Greek hugely impressed supporters, he will have to do something very special to dislodge Robertson from the starting XI.
The former Hull City defender - who Liverpool paid £8 million for - has become one of the first names on the teamsheet and Liverpool fans will be hoping he stays at Anfield for a very long time alongside the likes of Alexander-Arnold and Salah.