Derby County boss Paul Warne says his players failed to use the lure of a glamour FA Cup tie against Manchester City as inspiration to avoid crashing out of the competition at Leyton Orient.

beaten 6-5 on penalties at the Gaughan Group Stadium on Tuesday.

The third-round tie against third-tier Orient, who finished the match with 10 men, had ended 1-1 after extra-time.

Orient's victory means they will host Pep Guardiola's Premier League giants in February.

"Their motivation was there but it didn't transcribe into a performance as well as we needed it to be to win," Rams boss Warne told BBC Radio Derby.

The match had been re-arranged because of freezing conditions at the weekend, which meant both sides knew what high-profile date awaited the winner.

Warne says he referenced the enormity of the potential tie in the days after the draw was made.

He even used his own experiences of playing for Rotherham against Liverpool in 2001 to highlight the life-long memories that could be created.

"We spoke about it in the hotel, and again in the dressing room, that I think the FA Cup is for the players and the fans, and not so much the staff," Warne added.

"I still remember the game I played at Anfield and my family still talk about it, so it would have been a good game for them to play in and, obviously, for the new lads at the club it would have been a great game."

Orient, who had been beaten 3-0 both home and away by Derby when they were together in League One the previous season, took the lead on Tuesday through Charlie Kelman.

Dajaune Brown, however, restored parity soon after in a game that both sides looked to win before it went to a shoot-out.

Tom Barkhuizen went the closest to winning it for Derby with an effort that was deflected onto the crossbar in normal time.

Even when Orient went down to 10 men, following Sean Clare's dismissal for a second bookable offence in the second half of extra-time, the Rams failed to break the hosts' resistance in a game Warne called "just a pretty stalemate cup-tie sort of a night".

Both teams scored their first five penalties before O's goalkeeper Josh Keeley saved from Callum Elder, which allowed Zech Obeiro to fire Orient into the fourth round.

"We were literally like the nearly men," Warne said. "We were close to doing something but we weren't close enough."