Lukaku, brother to Manchester United striker Romelu Lukaku, is a left back who can also be used in an advanced position out wide on the left flank.
While not always a starter for Simone Inzaghi’s Lazio, Lukaku made 44 appearances for the Rome club in all competitions last season, netting a single goal.
At present, Saints are brimming with left-sided defenders in Ryan Bertrand, Matt Targett and Sam McQueen. But all three players have been linked with moves away from the club in recent times.
As for Lukaku, the report claims he is longing for a move to a Premier League club to be closer to his big brother.