They said: "Our thoughts go out to the United fans, their friends and families affected by the tragedy in Calabar, Nigeria, yesterday".
Many Nigerians prefer to watch football games at the viewing centres, for a small fee, instead of watching at home.
A survivor of the tragic incident told newsmen that a transformer near the viewing centre located in the Iyang-Esu area of the Calabar Municipal Local Government Area exploded during the match and caused a high-tension cable to drop on the viewing centre.
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"I heard a deafening bang".
Police confirmed at least seven were killed but officials fear the toll could be far higher after the tragedy in Nigeria, with ten more said to be critically injured.
"According to the information we gathered the high tension electric cable that was very close to the viewing centre fell on the building".
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"When I turned back to go inside the viewing center, I saw a cable coming down on the center and this electrocuted the viewers in the hall". I wish I didn't come out to watch the match.
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The statement reads in part: "The President offers his deepest condolences to the family and friends of the mostly young victims, whose sudden demise is a big blow not only to their families, but also to the football-loving nation".
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Also, the country's President Muhammadu Buhari on Friday expressed shock over the event, in a statement issued by his Senior Special Assistant on Media and Publicity, Garba Shehu.