Leeds striker Kemar Roofe has been ruled out of the second leg of his side's Sky Bet Championship play-off semi-final against Derby.
Roofe's 15th goal of the season in Saturday's first leg at Pride Park gave Leeds a 1-0 aggregate lead, but he will miss out due to a calf strain.
Defender Pontus Jansson remains doubtful due to an ankle injury, while midfielder Adam Forshaw, forward Tyler Roberts, full-back Barry Douglas and winger Gjanni Alioski are definitely out.
"(Adam) Forshaw won't be available," Bielsa said. "(Pontus) Jansson will (on Tuesday) try to work normally. And we will see how he is.
"Roofe won't be available either. Kemar's problem is more simple than Adam's, but still he won't be available for Wednesday's game."
Striker Patrick Bamford could return to the starting line-up in Roofe's absence after completing a two-game ban.
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