After being introduced as a half-time substitute during Brazil's 2-0 friendly win over Croatia at Anfield, Neymar ran at right back Sime Vrsaljko before, cutting inside and belting the ball into the net via the crossbar.
Neymar swapped shirts with Luka Modric after Brazil's win over Croatia.
Neymar suffered a fractured foot while playing for PSG against Marseille in Ligue 1 on February 25.
Brazil will undoubtedly be careful with the 26-year-old, who is arguably their most important player.
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Coutinho switched to a more orthodox midfield role after the introduction of Neymar, on the left, at the break and Firmino played the last half hour in the middle after replacing Jesus. "I respect Tite's opinion (in starting with Jesus) 100 per cent", Firmino said.
Coutinho's departure from the Reds in January to join La Liga champions Barcelona left a bitter taste in a number of Liverpool fans' mouths. "By the third, fourth or fifth game then he will be back to his level", added the Brazil coach.
The defeat was Croatia's second in their last three friendly games (won one) ahead of the FIFA World Cup.
Monday will be a rest day for the team and Brazilian media claimed midfielder Fred will be travelling to Manchester for medical tests before signing a deal with Manchester United.
Neymar's strike was a rare moment of quality in a match in which both sets of players seemed eager to keep injury risks to a minimum, with less than two weeks to go until the start of this year's World Cup finals.