(CNN) -- Premier League Manchester City crashed out of the English FA Cup after a humiliating 3-0 defeat to second-flight Nottingham Forest in a third round tie on Saturday.
Joe Garner celebrates his clinching third goal for Forest at Eastlands.
The shock result casts fresh doubt on the future of City manager Mark Hughes who is set to be handed millions by the club's Abu Dhabi backers in the transfer window, but saw his current line-up dismantled.
It was not the only upset with fellow Premier League side Stoke beaten 2-0 by Hartlepool and title challengers Chelsea held to a 1-1 draw by lowly Southend at Stamford Bridge.
City's first January signing England international Wayne Bridge was paraded before the kick off at Eastlands and then watched on as Nathan Tyson and Robert Earnshaw put Forest two up by half-time.
City also lost star winger Shaun Wright-Phillips to an 18th minute hamstring injury and scarcely improved after the break with Joe Garner scoring Forest's clinching third in the 76th minute.
It was the signal for thousands of City fans to head for the exits as their last chance of silverware this season disappeared at the first hurdle.
Forest have been struggling this season and sacked manager Colin Calderwood last week, but played above themselves in true FA Cup tradition.
Striker Tyson let fly with a dipping first-time volley to beat Joe Hart in the 39th minute and Earnshaw scored the second soon afterwards from close range as he deflected home a wayward shot.
City, who were without Brazil star Robinho, had their chances to get back into the match, but victory was sealed as Dietmar Hamann's poor throw in was seized upon by Garner who converted easily.
"We are bitterly disappointed with the level of performance that we produced today," Hughes told Press Association.
"Nottingham Forest fully deserved to win. They showed more desire and energy in their play. They forced us into errors and took their chances."
Earlier, third-flight Hartlepool easily accounted for relegation-threatened Stoke, who rested several regulars for the trip to Victoria Park.
Michael Nelson and David Foley scored Hartlepool's goals in the second half.
Chelsea must now face an unwanted replay after minnows Southend equalized through Peter Clarke in injury time.
Salomon Kalou had put Luiz Felipe Scolari's men ahead in the 31st minute and the Brazilian manager rued their failure to convert chances.
"I need to teach to my players more concentration when they arrive in front of goal," he told Press Association.
"They need to score more goals and get more confidence."
Southend's fellow League One side Peterborough drew 1-1 at Premier League bottom club West Bromwich Albion, while FA Cup holders Portsmouth were held goalless at home by second-flight Bristol City.
But other Premier League clubs were in better form with leaders Liverpool accounting for Preston 2-0 in the late kick off.
Albert Riera put Liverpool ahead with a curling first half strike.
Substitute Fernando Torres scored the second with the last kick of the match after being set up by Steven Gerrrard, who played despite being charged with assault and affray earlier in the week.
Arsenal beat Plymouth 3-1, Robin van Persie scoring twice, Everton won 1-0 at Macclesfield and West Ham thrashed Barnsley 3-0.
Middlesbrough accounted for Barrow 2-1 and Fulham won 2-1 at Sheffield Wednesday while Newcastle drew 0-0 at Hull with Shay Given playing in goal for the visitors despite rumors of his departure in the transfer window.
In another all-Premier League clash, Sunderland beat Bolton 2-1.
Non-league Forest Green almost pulled off a famous giant killing win before Derby County came through 4-3 after trailing 2-0 and 3-2.
Manchester United, who have won the FA Cup a record 11 times, go to second-flight strugglers Southampton on Sunday.