Nigeria will on Saturday, November 12 take on Algeria in the World Cup qualifier in Uyo.
Iwobi and Iheanacho who were both on target for the Super Eagles in their 2-1 win at Zambia in the opening round of the qualifier are already in camp.
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The Premier League stars were pictured on the flight from London to Nigeria on the night of Sunday, November 6.
They arrived Abuja and joined their teammates at the Bolton White Hotels and Apartments where the team is based.
According to the Nigeria Football Federation, other players in camp include Daniel Akpeyi and Ikechukwu Ezenwa, Musa Muhammed, Onazi Ogenyi, Dan Akpeyi and Ikechukwu Ezenwa.
Watford striker, Odion Ighalo who missed out of the squad in the win over Zambia due to the funeral of his late dad, is back in the squad and also among early arrivals.
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Nigeria lead the group with three points, Algeria and Cameroon joint-second with a point each while Zambia are bottom with zero points.