The 35-year-old enjoyed the most prolific years of his career with Saints, helping the south coast club rise from League One to the Premier League and becoming an England international along the way.
In the summer of 2014, Lambert’s dream move to his boyhood team, the Reds, materialised and he spent a single season at Anfield.
Now retired, he will watch Sunday afternoon’s showdown as a spectator, but it is not just his allegiance to each side that leaves him indecisive on the potential outcome.
“Southampton have obviously been through a dip. [But] they have had a couple of good results recently so they are on a bit of a high,” said Lambert on this week’s episode of LFC Later.