BBC Sport
Two Championship wins this season have been accompanied with six draws and five defeats in the league for Saints, who were relegated from the top flight last season.
Those two victories came on the opening day of the season at home to Wrexham and away at Sheffield United on the final day of September.
After beating Northampton Town and Norwich City in the EFL Cup, they were knocked out of the competition in a 2-1 defeat at Liverpool.
Still’s sacking comes after a run of five games without a win, consisting of two draws and three defeats.
He told BBC Radio Solent after Saturday’s defeat that there was not an “instant fix” for the side after another loss.
“If I’d got an instant fix I would…