Barcelona fell to a shock 3-1 defeat away to Levante on Saturday after taking the lead but then conceding three times in the space of seven minutes in the second half, ending a seven-game winning streak in all competitions. Lionel Messi converted a first-half penalty at the City of Valencia Stadium for his sixth goal in five games only for Levante to stun the defending champions with an incredible treble shortly after the hour. Jose Campana and Borja Mayoral scored in the 61st and 63rd minutes before Nemanja Radoja added a third in the 68th to finish Barca. After seven consecutive wins in all competitions, Barcelona arrived in Valencia as overwhelming favourites to cement their place at the summit, particularly given the irresistable form of Messi. His goal was the 500th of his career with his left foot and it looked likely to give Ernesto Valverde's team another three points until bedlam ensued in the second half. To make matters worse for Barca, Luis Suarez was forced off in the 41st minute with an injury to his right calf and would now appear to be a doubt for Tuesday's Champions League game at home to Slavia Prague. Levante started well and Barcelona were fortunate to escape a ragged few minutes that included Suarez being booked for a foul committed by Arthur Melo. Referee Hernandez Hernandez corrected his error after being made aware by VAR. Nelson Semedo twice slipped Antoine Griezmann in behind right-back Jorge Miramon, who then conceded the penalty. Levante began the second half on the front foot but nobody could have predicted what was to follow as three Levante goals turned the game on its head. First, Pique's clearance came straight back as Mayoral and Jose Morales shifted the ball quickly inside to Campana who struck hard into the corner. Then a loose Perez header allowed Mayoral space and he did brilliantly to curl past the right hand of Marc-Andre ter Stegen. With the home fans still celebrating, Radoja made it three. Barcelona again failed to clear and Radoja's effort might have been saved had Sergio Busquets, on as a substitute, not shot out his right leg and caused a cruel deflection. Messi thought he had launched a comeback when he bundled through and scored but the goal was ruled out after Griezmann was spotted to have been offside. That seemed to kill Barca's belief and, if anything, Levante should have made it four late on. Gonzalo Melero had only Ter Stegen to beat but shot wide.