Jose Mourinho 'not happy' but Chelsea boss is refusing to panic ahead of bid for first win of the season at West Brom

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Jose Mourinho is keeping his cool despite Chelsea's worst start to a Premier League season in 17 years.

The defending champions play at West Brom on Sunday seeking a first win of the season after opening with a 2-2 draw at home to Swansea and a 3-0 loss at title rivals Manchester City.

'Do we have to improve? Obviously. Always,' Mourinho said.

Jose Mourinho insists he is remaining calm despite his dissatisfaction with Chelsea's start to the season

The Blues boss is chasing a first win of the season for his club after recording just one point in two games

'We are calm, not happy, but calm. We need that. We need to be unhappy because that feeling makes you work better, better than ever when the results are not good and to be calm is very, very important too.'

Chelsea signed left-back Baba Rahman and forward Pedro this week, the latter after the Blues moved swiftly to swoop ahead of Manchester United.

Mourinho has previously spoken of working with a squad of 22 senior players - two in every position - and Pedro's arrival inflated the first-team group to 23 men.

But the Portuguese insisted that does not necessarily mean any players will be leaving prior to the September 1 closure of the transfer window.

Chelsea have boosted their forward stocks with the signing of Pedro from Barcelona

The arrival of left-back Baba Rahman (left) takes Chelsea's squad to 23 players but that is fine with Mourinho

'It's not a compulsory thing. I can perfectly have one more player than is normal for us,' Mourinho said.

'One more option for me is not a problem. You have injuries, you have suspensions, different competitions to play.

'Hopefully we can progress in the domestic cups too and there are lots of matches to play.

'If you have one more winger in the group, it can be a problem for the wingers not getting the playing time they want, but for me it's not a problem.'