The clinching penalty was left to Vedran Corluka, who rifled past Heinze before being predictably mobbed by his team-mates.
The 21-year-old is Eriksson's fourth signing in two days after deals for Javier Garrido, Vedran Corluka and Elano were completed on Thursday.
His bustling style caused problems for the City backline, and Croatian right-back Vedran Corluka had to make an athletic block from a Scharner effort.
At the other end, Vedran Corluka and Modric combined to tee up Defoe but the England striker was denied from close range by the excellent Green.
Tottenham do, however, have a host of injury worries, with the likes of Tom Huddlestone, Michael Dawson, Ledley King, Vedran Corluka and Robbie Keane ruled out.
Ramos has also spent big on Luka Modric, David Bentley, Roman Pavlyuchenko and Vedran Corluka while losing the services of strike duo Robbie Keane and Dimitar Berbatov.
Vedran Corluka, who played at right-back on Sunday, is cup-tied for the club's Uefa Cup trip to Nijmegen on Thursday, while skipper Ledley King will be rested.
Fulham enjoyed the better early as Danny Murphy had a shot from the edge of the box blocked by Vedran Corluka and Johnson blazed over from 12 yards.
Aiden McGeady's wickedly inswinging free-kick from the left caught Vedran Corluka cold at the back post, as Sean St Ledger sneaked in to head past Croatia keeper Stipe Pletikosa.
But the Newport-born player has only played a bit-part role for Tottenham, as Gunter is one of four top-class right-backs that include Pascal Chimbonda, Alan Hutton and Vedran Corluka.
City's Vedran Corluka ghosted into space and lashed a 25-yard drive narrowly wide on 10 minutes, while Vassell saw a deft flick-on whistle wide from a Martin Petrov free-kick.
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Gattuso and 59-year-old Scot Jordan had already clashed on the touchline during a bad-tempered second half in which Mathieu Flamini escaped with a only booking for a two-footed challenge on Vedran Corluka.
As Spurs threw men forward in desperation, the excellent David James made a crucial block from Vedran Corluka before victory was sealed in front of Portsmouth's ecstatic fans three minutes from time.
The first spot-kick was given in the fourth minute after Jussi Jaaskelainen parried Michael Dawson's header straight to Vedran Corluka, whose prod towards goal was stopped by the arm of Kevin Davies.
In the trio's absence, Dorian Dervite could get a chance to impress - the 20-year-old made his only competitive start in November 2006 - while Vedran Corluka and Tom Huddlestone can also play at centre-back.
Vedran Bogdanovic, a veterinarian and dairy farm manager of close to 400 cows in Kapelna, Croatia, says Farmeron helped him meet laws for animal tracking and sales and also for reporting animal deaths to insurance companies.
Within minutes, Jelavic just failed to climb high enough to connect with a cross from fellow substitute Ivan Perisic and Croatia were furious when Vedran Corluka appeared to have his shirt pulled in the penalty area, only for the offence to go unseen.
Flamini, jeered roundly for the twin crimes of previously playing for Arsenal and for his horror tackle on Vedran Corluka in the first leg, almost silenced the taunts with a low drive that flew inches wide with no colleague able to apply the final touch.
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