Koeman's troops sit seventh in the table, a full 19 points behind the Foxes at the summit, and the Dutchman has stated that he disagrees with his Argentine counterpart's assessment of the title race.
"I do not agree with Mauricio," he told a news conference, as quoted by The Mail. It is nice to hear that Southampton is one of the seven teams that are still fighting but I do not see it like that.
"In my opinion it is between Tottenham and Leicester. Everything is possible, it is all about us and if we keep the level and the spirit, we know we are fighting for European football, fifth and sixth position on the table not the first four teams.
"If we want to play in Europe then we need more points than six(th) and it starts this Sunday. Everybody is playing for something and that is nice for the Premier League. There is pressure everywhere."
Koeman could do his predecessor a big favour on Sunday if Southampton beat Leicester at the King Power Stadium, though of course second-placed Spurs, who sit two points behind City, must beat Liverpool at Anfield tomorrow.
Either way, a win over the Foxes is unlikely to do much for the Saints' title hopes, though it might yet improve their prospects of securing European football for a second successive season.
They sit three points behind fifth-placed West Ham United in the only guaranteed Europa League position.