The Brazil forward, making his much-anticipated first appearance for PSG since joining them from Barcelona for a world-record 222million euro ( £200.6million) transfer fee, opened his account with a simple close-range finish in the 82nd minute, set up by Edinson Cavani.
The world’s most expensive player was allowed to take to the pitch at the Stade de Roudourou after the French Football Federation confirmed they had received the relevant paperwork for the £199million signing.
However, any thoughts of a shock result were soon ended as PSG took the lead with 52 minutes gone, although it was a gift of a goal from the hosts as Jordan Ikoko misjudged his back-pass, which rolled past the keeper and into the back of his own net via the post.
Not to be upstaged, Neymar had a more direct influence on PSG’s second as his delightful throughball released Cavani to coolly beat Johnsson.
Neymar helped carve out the first real chance in the 15th minute, combining neatly with Thiago Motta to free Cavani but Johnsson saved with his legs to deny the Uruguayan.
Neymar would go on to put a goal and assist to his name. Following a Neymar pass which was cut out by a Guingamp defender, the ball came to Ikoko standing two metres from the penalty spot.
PSG are second in the league on six points, behind Lyon on goals scored with Monaco, who thrashed Dijon 4-1 away earlier on Sunday, in third place also on six points. Cavani returned the favour for Neymar late on, selflessly teeing up the former Barca man to poke home the first of what looks likely to be many goals for Paris (82′).