Luka Jovic admitted he was "tired" after scoring the winner in Serbia's 1-0 win over Sweden in the Nations League on Thursday.
Jovic scored the winning goal for the Orlovi at the Friends Arena just before half-time, driving home Strahinja Pavlovic's header back across the penalty area from Dusan Tadic's corner.
The 24-year-old striker put in a commendable performance over 77 minutes despite the lack of match minutes at club level, seeing 551 minutes across all competitions for Real Madrid this past season.
After the match, Jovic revealed his fatigue was different to that of his team-mates.
"Honestly, I'm tired after this match," Jovic told RTS. "I believe the others are too, it's a long season, they’ve played a lot of games.
"I haven't played a lot of games this season, which is also a problem, probably an even bigger one than theirs. We have to tighten up, play that one more game and suffer for those three points."
The Orlovi bounced back from their opening Nations League loss in Belgrade to Norway, moving to six points with the win over Sweden, after defeating Slovenia on Sunday.
Jovic asserted it was important win, keeping Serbia in contention for promotion to League A.
"It was a very important victory for us," Jovic said. "We kind of broke back because we lost the first game in Belgrade.
"I think we played a good game, in a fight, against a quality opponent. We are going to Ljubljana to try to take three points."