Paris Saint-Germain's expensive stars again failed to deliver the flair to match the club's huge financial outlay, so it was left to 18-year-old homegrown player Adrien Rabiot to break newly promoted Guingamp's resistance on Saturday.
PSG scraped a 2-0 home win after netting twice in injury time as Rabiot came off the bench to grab his first goal for the club, and then Zlatan Ibrahimovic ended his scoring drought moments later with his first goal of a frustrating season.
It was PSG's second straight win after last weekend's equally difficult 2-1 victory at Nantes, another promoted club, and underlined how Blanc's team has yet to play with fluidity and teamwork despite having near unlimited funds to recruit top talents.
Striker Edinson Cavani and center half Thiago Silva both hit the crossbar with headers from corners in the first half. Ibrahimovic had almost scored in the fourth minute with a curling free kick that hit the post, and winger Ezequiel Lavezzi missed an open goal as the rebound landed at his feet.
PSG needed a handling error from visiting goalkeeper Mamadou Samassa to break the deadlock in the first minute of injury time, when Rabiot kneed the ball over the line after Samassa palmed a shot into his path.
Two minutes later, Ibrahimovic ran onto a long pass, muscled defender Jeremy Sorbon off the ball and slotted it past Samassa for his first goal in five games this season.
The win moved PSG provisionally up to second place with eight points.
Earlier, seventh-placed Lyon's losing streak increased to four matches after they lost 2-1 at Evian.
Despite Jordan Ferri's second-half strike, a first-half Kevin Berigaud brace was enough to inflict a second consecutive surprise defeat on Remi Garde's men following their 1-0 loss at home to Reims last week.
Vincent Aboubakar scored the only goal as Lorient condemned Valenciennes to a third consecutive Ligue 1 defeat.
VA beat Toulouse 3-0 on the opening day of the season but they have not claimed a point since then and things got worse for them on Saturday night with the dismissal of Rudy Mater for two bookable offences.
The home side could have had the lead after five minutes as Alain Traore made a surging run down the left and crossed to find Raphael Guerreiro but he could only volley over the bar.
Just eight minutes later they were ahead as Yann Jouffre found Aboubakar in the box and the Camerooninan striker rounded Fabien Audard and slotted into the empty net.
Toulouse slipped to the bottom of the Ligue 1 table following a 2-1 defeat at the hands of 10-man Bastia.
Claudiu Keseru put the Corsican side ahead two minutes before half-time despite having lost defender Julian Palmieri to a straight red card for a challenge on Oscar Trejo six minutes earlier.
Toulouse hit back in the 57th minute through Martin Braithwaite but were unable to further capitalise on their one-man advantage, with Bastia instead going on to score the winner through Romaric 10 minutes later.
Rennes and Lille headed into their game in good spirits having picked up six points from their opening three games, but played out a disappointing goalless draw at the Stade de la Route de Lorient.
Reims missed the chance to go level on points with Ligue 1 leaders Marseille after they played out a goalless draw with Nantes.
Sochaux and Ajaccio also played out a goalless draw at Stade Auguste Bonal to leave both clubs still without a win in Ligue 1 this season.