The Cottagers beat Leicester at the King Power Stadium earlier this season.
The striker was involved in all of the away side's goals in their 3-1 victory.
After the game, Bielsa spoke to the media about the result and performance.
"They will not be fit for Wednesday either at Fulham and I don't have a particular game in mind to say when they will be fit".
"We are obviously really disappointed". Today, we could have defended better, we gave away poor goals and we didn't take our chances. "We had opportunities, but they were giving us problems with their running against the backline", added Rodgers.
And in the 84th minute Leeds put the game beyond all doubt with a breathtaking counter-attack to ran out 3-1 winners. It was a hard result for us to achieve.
Proud of the evolutions as individuals and as a team since you arrived?"The player should choose the club and after that the club will decide", Bielsa said. "I know Nathaniel from my time working with him at Chelsea, but I know lots of players and there are a number of players that we are looking at".
Why do you value Patrick Bamford so highly?
Bamford had a role in each of Leeds' goals against Leicester, scoring once and creating two in a brilliant individual performance.
On ending a four-game goal drought, Bamford said: 'I would love to say I don't think about it, but all strikers do.
"Normally the goalscorers prefer to score themselves rather than give the pass", Bielsa explained. "The goals we are very disappointed with".
Victory owed to players willingness to put in a big physical effort?"We are all trying to help and support him during this injury".
"I wouldn't be able to make a judgement", he said.
"We've been on a fantastic run and it was always going to come to an end at some point".
Transfers - will there be any signings or outgoings from the first team squad?
"When it comes to a player staying at the club, the first and most important thing is that the player wants to stay".