The returning Lionel Messi scored twice but was unable to prevent LaLiga leaders Barcelona slipping to a chaotic 4-3 defeat to Real Betis at Camp Nou.

Messi – making his first appearance since fracturing his arm against Sevilla on October 20 – could only watch on as Barca's defence was ripped apart by Betis, who ended a run of eight straight defeats away to the Catalan side.

Ernesto Valverde's men started sluggishly and were punished after 20 minutes when Junior scored his second league goal of the season before veteran winger Joaquin doubled their advantage 11 minutes before the interval.

Messi pulled one back from the penalty spot after 68 minutes before Marc-Andre ter Stegen spilled Giovani Lo Celso's shot into his own net three minutes later.

Arturo Vidal gave Barca hope of a grandstand finish 11 minutes from time but Sergio Canales slid home a Betis fourth with seven minutes remaining and not even a second from Messi in stoppage time – given after a VAR review – could save the hosts.