Warnock's men defeated Premier League sides Everton and Southampton at the end of last year, before their Capital One Cup run ended with a heavy defeat to the European champions.
With Spurs continually advancing during Andre Villas-Boas' reign at White Hart Lane - they currently sit third in the table ahead of both Arsenal and Chelsea - arnock believes they will soon be challenging for a top-two spot, having watched them in action as they drew 1-1 with Manchester United.
Speaking ahead of Sunday's showdown, he said: "They're an excellent team and when you watch them get 61 per cent possession against Manchester United, you realise what you are up against.
"I didn't see a weakness in them last weekend. They are playing with a freedom and are relaxing now that Andre Villas-Boas has got his feet under the table. I think they'll be pushing the top two soon.
"If you look at their team from one to 11, they have everything that I look for in a team. Pace, power, strength and entertainers. I think they are a better side than Chelsea."
Speaking about strengthening his squad during the remainder of the January window, Warnock added: "I can only look at my time and how we're looking to improve the squad. Ask me next Friday when the window has closed. I think, by my reckoning, the window lasts for 31 days not 21, so wait until after that.
"I don't have to sell at all. I am looking to improve the squad, you will have to wait and see."