Michael Tonge has told The Yorkshire Evening Post that Tottenham Hotspur should not take Sheffield United lightly.
The first leg of the tie will be played at White Hart Lane in North London on Wednesday, with the Blades to host the second leg at Bramall Lane next week.
Tottenham will head into the tie as heavy favourites, but former United midfielder Tonge has warned Mauricio Pochettino’s side against complacency.
“Southampton are having an excellent season and yet Sheffield United beat them comfortably, by all accounts,” the Leeds United star told The Yorkshire Evening Post.
“Of course, a big difference to 12 years ago is we played at home first. I honestly don’t know which is the best way round.
“But if Sheffield United can get a draw or even a one-goal defeat down there then everything will be to play for back up at Bramall Lane.
“I know from experience just how special those Cup nights can be under the lights. The supporters really get behind their team. Spurs are in good form right now but I doubt they’ll relish that atmosphere.”
United may be playing in League One, but Nigel Clough’s side’s chances of a League Cup upset cannot be written off.
The Blades have improved massively under Clough over the past year or so and are in firm contention of promotion to the Championship.
The first leg of the semi-final tie will be key. If the Sheffield-baed outfit can get a draw or even lose by 1-0, then they could well be on their way to the final, which will be held at London’s Wembley Stadium.
Tottenham will have to win the first leg by at least two clear goals to give themselves a strong chance of progressing to the final.
Pochettino must played his best available starting line-up at White Hart Lane, or else he could be in for a shock.