It was after five games, four league and one league cup. The league cup he got a win against Ipswich, who were lower division (Championship I think). He was sacked for many reasons:
The league games were fairly easy and were all losses with no goals scored, including, if my memory is correct a 0-4 loss at home to Huddersfield who were favourites for relegation.
He upset lots of players by telling them they weren't needed but then failing to sell them and having to use them.
He played players out of position so he could play his favoured style and formation.
He told the board he would gradually move to a more Ajax style of play, but then changed too quickly without players who could do it.
He used youth players in the first team who were nowhere near ready for the first team.
Hopefully the OP isn't that bad a manager!