The forward was delighted with his two goals in the defeat to Argentina but says they must be prepared for the fight in the knockout phase
Stephen Keshi's side secured a place in the knockout phase despite a 3-2 defeat to Argentina on Wednesday as Bosnia-Herzegovina beat Iran 3-1.
The CSKA Moscow attacker was delighted to net both of the Super Eagles' goals against the Albiceleste but insists they will need to work harder in the next round, in which they are likely to face France.
"We were hoping to win the game, we tried our best but couldn't equalize for 3-3," Musa said on SuperSport.
"That is football for you. The most important thing was that we qualified for the second round, which is a great achievement for us.
"I'm very happy to score today. And delighted scoring against Argentina and Lionel Messi.
"We have to work harder, it will not be easy. In the first half they had a lot of opportunities in the middle. So we need to work more on that in the second round."