Leeds United have conceded 10 goals from set pieces so far this season.
Leeds let in another goal from a dead ball situation against Queens Park Rangers in the FA Cup at the weekend, and they have struggled to keep out corners and free kicks in the league.
Leeds have conceded 10 goals from set pieces in the Championship this season, which is the ninth highest total in the division.
And Bielsa believes that the absence of three of Leeds’ best aerial players is impacting on his side’s ability to defend.
“It is not a new problem,” he said. “Every week we dedicate a high percentage of time to set-pieces. We have a look at what’s not well done and we try to correct it.
“Of course we try to find the solution to this problem with different players, but our best headers are (Liam) Cooper, (Pontus) Jansson and (Gaetano) Berardi. At one point we stabilised the problem, but as they are not in the team this problem is coming back again.”
Leeds were dumped out of the FA Cup against QPR at the weekend, with Bielsa naming a young side for the contest.
The Whites’ youth prospects were edged out of a close encounter, with QPR winning 2-1 at Loftus Road.
Leeds have now lost three matches on the bounce, and they will want to ensure this minor blip does not turn into a slump over the coming weeks.
Bielsa’s side are next in action on Friday evening when they take on Derby County.
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