Chelsea laboured all 90 minutes against Southampton at Stamford Bridge on Wednesday night, but the Blues could only get a goalless draw in this game.
Chelsea had 72 percent possession of the ball and 16 shots in total but none could go past Angus Gunn who was only making his debut for the saints.
Chelsea striker Alvaro Morata had a goal ruled out for offside in the second-half, and it looked a debatable decision as Morata seemed to be onside in what was a very tight call.
That goal could have changed the course of the game, but referee Jonathan Moss chose to go with his assistant who raised the flag.
Asked if the referee was wrong to have ruled out the goal as offside, Sarri admitted that he didn’t really have a clear view of the incident.
He said: “I don’t know, it was too far from the bench to see it clear. I saw the two goals by Giroud in the last match, I don’t know if he was offside in that match, it was difficult.
“I have no idea about this goal.”
Sarri watched on from the sidelines as his team struggled to go past Southampton’s defence all to no avail, and the Blues boss was asked if he was frustrated with the game, Sarri said: “Nothing I think. I tried to do my job I think. On the bench I tried to do my job. We played very good for 80 metres of the pitch, then in trouble for the last 20 metres.
“It is not easy to create a lot of goal opportunities in this kind of match. It was not easy. If you can get the first goal you can create opportunities. We have to solve the problem of the last 15-20 metres. In the last matches we have been in full control. For us it is not easy to score the first goal. We have to solve this problem.”