And the Toffees are not finished there, as negotiations continue with Swansea over B£50m-rated playmaker Gylfi Sigurdsson.
"First of all we have big ambitions that we like to show to everybody".
"Like everybody knows we are still working on some targets and that is hard, but if we can do the business we want I think we are stronger than last season".
"But of course it is hard with the big clubs".
"It is hard still because we really have one striker".
"They've got a good side and they've spent money from letting good players go, perhaps similar to Southampton a couple of years ago. We can improve and spend money but everyone can improve and is spending money", he explained.
Rooney and fellow new signing Sandro Ramirez (formerly of Malaga) will lead the attack for the Toffees.
After Diego Costa fell out of Antonio Conte's plans, the champions paid Real Madrid a reported £70million to sign Alvaro Morata, while United parted with £75million to buy Romelu Lukaku from Everton. I don't say impossible but 25 goals is a lot and we need to find other ways.
"We have the experience of what we need to pay for players who came here and had one year of contract. We brought some players in but we would like to bring some more in".
Meanwhile Everton striker Wayne Rooney is set to make his second Premier League debut for the Toffees after Koeman revealed that he had been selected to start this weekend.
Koeman said: "We know it is a tough start but it is all about, in 38 games, getting the points".
The striker looks to have the physicality and keen eye for goal to thrive in the Premier League, but does he have the right mentality? It is always better to start at home than away.
If Kompany stays fit, City's status as Premier League favourites looks understandable but if he gets injured again, it might not matter how many goals they score at the other end. Let's hope we get an agreement as soon as possible. Everton have enjoyed a positive head-to-head record against the Potters too.
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