Martins has not featured for the Super Eagles for three years.
Obagoal, who has also played in the US Major League Soccer, now plays for Chinese Super League, CSL, side Shanghai Shenhua.
The 32-year-old said he can still contribute his own quota to the Super Eagles if called up by coach Gernot Rohr. He, however, said he respects the fact that young players need to be given opportunity in the team.
Martins told reporters, “I never am through with international football. If the new coach of Nigeria Gernot Rohr needs me, I will gladly honour his call. I am fitter than ever.
“You have to respect the quality of the young players who are coming through with the national team, they deserve to be given their chance in the team.
“Playing in China is way higher than in the past, we now have top model professionals in the league, so it’s no longer a case of if you go to China, you are winding down your career.”