Skipper Ahmed Musa is among the early arrivals at the Super Eagles training camp in Lagos with Galatasaray pair of Henry Onyekuru and Oghenekaro Etebo the latest players in.
Other arrivals are William Ekong, Ola Aina and Semi Ajayi, who are all based in England.
Ahmed Musa, who has been without a club since October, will be a “non-playing captain” according to coach Gernot Rohr.
The team are due to depart Lagos Thursday for Porto-Novo.
The game against home team Benin is billed for Saturday, before the Eagles then host Lesotho on Tuesday in Lagos.
Nigeria lead their qualifying group with eight points after four matches.
They need only a point to book their ticket to the 2021 AFCON to be hosted by Cameroon next year.
