David Moyes admits Sunderland won't get it right in the transfer market every time.
But the Black Cats boss believes club record signing Didier Ndong - signed for £13.6million from Lorient on deadline day - will prove a shrewd acquisition by Sunderland.
The Gabon international midfielder starred in the club's 2-1 EFL Cup third round win over QPR at Loftus Road.
And Moyes was quick to praise Ndong, who played on the right-side of midfield, with the 22-year-old a driving force behind Sunderland's win.
Moyes admits Sunderland are not a club with the cash levels to make "big, big signings" but the club did break their transfer record fee to bring Ndong to Wearside from Ligue 1 this summer.
And he believes Sunderland have a real talent on their hands as he looks to build on the EFL Cup win by turning around the form in the Premier League.
Sunderland are second-bottom and without a win in their opening five league matches, with Moyes keen to build on what Sam Allardyce achieved last season.
"I want to build on what Big Sam did," said Moyes.
"We shouldn’t be saying that avoiding relegation is a good thing, but would I take that at the end of this year? Of course I would.
"I think, with Didier Ndong, you would say ‘there might be a player there’.
"I hope that we get more, but I can’t do it in one window - as well as that, we are not a club with the cash to make big, big signings.
"Some we won’t get right, some we will get right, because of the market we are shopping in.
"But I thought on the QPR performance he did very well, although it is going to take time to build that level.
"Time is the word in this game, isn’t it, and we don’t always get it."
Paddy McNair was the hero for Sunderland, with the former Manchester United midfielder scoring twice in the space of 10 minutes to seal victory for the Black Cats.
Sandro had given Championship side QPR the lead on the hour mark but Sunderland - led by Ndong's energy and drive in midfield - hit back strongly.
McNair's winning goal came after Matt Ingram spilled Ndong's powerful drive, with a trip to Southampton the reward in the fourth round of the competition.