The 54-year-old oversaw Portsmouth's 4-1 defeat by Manchester United on Saturday that had begun brightly with Pompey holding the Premier League champions 1-1 at half time.
And he endured a second defeat in the Carling Cup quarter-final on Tuesday, going down 4-2 to Aston Villa.
The south coast side remain rooted to the foot of the table, three points adrift of 19th-placed Wolves.
Utaka is one of half a dozen Pompey players expected to represent their country at the Africa Cup of Nations in Angola this January for up to six weeks.
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