Ousmane Dembele gave Barcelona a glimpse into the future but Barcelona still needed Lionel Messi to beat Leganes 3-1 and restore their five-point lead at the top of La Liga.
Messi had started on the bench, rested by coach Ernesto Valverde, and for just over an hour at the Camp Nou, Dembele filled the void by scoring the opening goal in a sparkling individual display.
The 21-year-old, however, limped off with a sprained ankle in the 69th minute, shortly after Leganes had equalised through Martin Braithwaite and Valverde responded by introducing Messi.
He needed only seven minutes to make an impact as his bending shot was followed up by Luis Suarez, who poked the ball in ahead of Leganes goalkeeper Pichu Cuellar. Messi then rounded off the win by scoring himself in injury-time.
Leganes had protested against Suarez's finish, convinced that Pichu had been fouled by a high foot.
"It was a clear foul," coach Mauricio Pellegrino said.
"Barca don't need these kind of decisions to help them."
"We hope it is not too long."
- Messi swoops -