Gyan began his career with Liberty Professionals in Ghana before moving to Italian side Udinese in 2003.
The news leaves Bruce with only one fit striker, Asamoah Gyan, for Saturday's Premier League game at Blackpool.
He finished ahead of Ivory Coast and Chelsea striker Didier Drogba and Ghana and Sunderland forward Asamoah Gyan.
Nedum Onuoha, Danny Welbeck and Asamoah Gyan were all injured in the Black Cats' 2-0 home defeat by Blackpool.
Ghana's Gyan could command a strong sympathy vote after his dramatic hero and villain role at the World Cup.
"I don't doubt my quality, whether I am playing with two strikers or just one, " Gyan told BBC Newcastle.
Last week, Gyan was crowned BBC African Footballer of the Year for 2010.
And their best spell came in the last 20 minutes, with Gyan seeing two excellent efforts on goal go begging.
Straight after the interval Sunderland managed their first meaningful effort on goal when Asamoah Gyan blasted over from the angle.
Russian-based striker Baffour Gyan defender Kofi Amponsah of Greek side Apollon Kalamarias return to the squad after a two-year absence.
Welbeck, Bent, Jordan Henderson and Gyan all spurned at least two opportunities apiece as the hosts dominated possession and territory.
"It's sad that we have lost three games in a row, but the whole team is playing well, " Gyan added.
The Black Stars started brightly and had promising spells throughout, with striker Asamoah Gyan having the majority of their best chances.
Gyan said he was pleased to have joined the Black Cats and praised the fans for their "never say die" attitude.
Asamoah Gyan, Darren Bent and Danny Welbeck all squandered good openings and visiting goalkeeper Richard Kingson made a number of excellent stops.
In a statement streamed live on the Internet, Electoral Commission Chairman Kwadwo Afari-Gyan declared "John Dramani Mahama president-elect" after securing 50.7% of the vote.
Gyan's arrival comes on the day it was announced that striker Fraizer Campbell will be out for at least six months after rupturing cruciate ligaments.
Gyan's early goal, while it should have opened up the game, had the opposite effect - Ghana seemed more than happy to settle for a 1-0 lead.
But Gyan missed the best openings, shooting into the side-netting after showing good strength when chasing a long pass, and then hopelessly miskicking from six yards out.
Johan Djourou needed to be alert to clear a low Jordan Henderson cross with Asamoah Gyan ready to pounce, while Phil Bardsley drilled narrowly wide from 20 yards.
In some quarters, that made him second favourite to Gyan, whose goals helped take Ghana to the World Cup quarter-finals, where they were eventually beaten on penalties by Uruguay.
On 73 minutes, a long and patient build-up from the Black Stars almost produced an opener when Gyan rounded it off by curling a beautiful shot just over the bar.
Five minutes later Gyan unleashed another fierce in-swinging effort from outside the area, this time from a free-kick, which was punched away unconvincingly by El Hadary in the Egypt goal.
The Black Stars, who are the second favorites to win the competition behind Didier Drogba's Ivory Coast side, beat Niger with goals from Asamoah Gyan, Christian Atsu and John Boye.
On Thursday, electoral commission head Kwadwo Afari-Gyan told the BBC that the biometric fingerprinting system had been extensively tested over two months and again earlier this week, when security personnel voted.
Sunderland were now carrying less of a threat and manager Steve Bruce's concern showed when he lambasted Gyan for losing the ball on the near touchline and then failing to chase back.
Gyan's early free kick hit the Egyptian wall and from the resulting corner, the ball fell back to the striker, who attempted an ambitious overhead kick, which sailed over Essam El Hadary's goal.
New Ghana coach Milovan Rajevac will put squad captain Stephen Appiah on the bench, but must do without injured striker Asamoah Gyan for a Group 5 showdown with fellow leaders Libya in Tripoli.
Ghana, who qualified for the World Cup Finals in South Africa with a 2-0 win over Sudan last Sunday, took a two-goal lead thanks to a brace from Asamoah Gyan before Kengo Najamura pulled one back.
The image of Mumbai as a liberal city ruled by law and reason has long turned out to be a chimera, according to Gyan Prakash, author of Mumbai Fables, a brilliant book on the restless city.
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