By Richard Martin BARCELONA (Reuters) - Barcelona coach Luis Enrique has played down talk of a rift with his squad after their surprise home defeat by Alaves and is hoping to put things right in their Champions League opener against Celtic on Tuesday. Spanish sports website Diario Gol reported on Monday that some players responded to a telling off following the 2-1 La Liga reverse on Saturday by questioning Luis Enrique's decision to make eight changes to the team. "We always talk with the players to try and put them on the right track to win the game but it is not an exact science." Barca's defeat was their first in 12 competitive matches and Luis Enrique said it was good for the players to be back in action so soon after losing to La Liga newcomers Alaves. More...