The Argentine introduced sweeping changes following his arrival in the summer but his trademark attacking tactics are yet to pay dividends.
Saturday saw Les Dogues go down 1-0 at Guingamp and it now means that after winning 3-0 on the opening weekend, Lille have scored just once in their last five.
After making a hatful of chances without reward on Saturday, Bielsa admits his team's profligacy in the opposition box is becoming an issue.
He said: "Undeniably, there is a disproportion between the number of chance we have had and the number of goals we score.
"The team's vocation is to attack, the composition of the team is mostly made up of creative players, with players taking depth, who can drop, sideways that go up with the ball, but all this does not translate into goals like should be the case."