Real Betis coach Manuel Pellegrini admits defeat at Celta Vigo was tough to take.
Celta won 2-1 with young Swede Williot Swedberg netting the winner scoring six minutes into injury time.
Pellegrini said: "It was very painful. Furthermore, I think we had the initiative of the party at that time. In the second half we played closer to their area.
"We had several shots or approaches that we couldn't convert and in the 93rd minute, on a counterattack, they caught us wrong and we lost the three points."
On taking off Isco before Swedberg's winner, he continued: "There were three or four more minutes left in stoppage time, we believed it was important to have fresh legs in the centre of the field to reach the area more and we decided that change.
"Well, the results... We have lost one game out of 14, we try to score as many points as possible, it has been 13 games since we lost, we will continue on the same path to see how we can win the games."
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