David Moyes is concerned that Everton's current financial position is leaving them behind.
The Toffees boss admits every transfer window generally proves to be particularly tough time for the Merseysiders.
During this window, the club opted to sell Steven Pienaar to Spurs as he was out of contract in the summer and able to leave the club on a free transfer.
The Scot told the Daily Mirror: "I've not really liked any of the last four or five windows, I've not enjoyed them because they have been really difficult for us.
"A lot of the summer we have been fighting off clubs who want our players. But it's the same for 90 per cent of managers - whether it be the January transfer window or the summer one."
Moyes admits he will only be able to bring in loan signings this month, which could be to the detriment of the club's long-term ambitions.
He added: "There is a worry we will stand still if we don't spend money, but if you have none, that's the way it is, you just have to deal with it.
"Our team spirit can only take us so far, but I have to get through this January window and try to take the team forward if I can with what we have."
Although Moyes is targeting Hoffenheim striker Demba Ba and Monaco forward Dieudonne Mbokani to ease the nerves of Everton fans, he admits things have been much worse in the past.
He added: "There's been times when there's not been an awful lot in the team, but I see us as having some really top players now - Everton's biggest assets play most Saturdays."