Nigeria, May 23 -- Owen Oseni, Plymouth Argyle's in-form forward, has admitted he could hardly believe the moment he received his first invitation to the Nigeria national football team, describing the call-up as one of the biggest achievements of his career so far.

The 23-year-old striker has been included in Nigeria's plans for the upcoming Unity Cup tournament in London and the international friendlies against Poland and Portugal, completing a remarkable rise after an impressive breakthrough season in English football.

For Oseni, whose career path has taken him through non-league football, Scotland and now England's League One, the opportunity to represent Nigeria felt almost unreal.

"I know I had an alright season, but to get called...