Star men Kalvin Phillips and Raphinha have both been injured of late and Bielsa said at his pre-match press conference on Thursday that the duo were being "evaluated on a daily basis to see whether they can be available" to face Spurs.
Asked if the pair had at least trained this week, Bielsa again said that the duo's presence was "subject to an evaluation that is carried out on a daily basis."
Raphinha has missed United's last three games with a thigh injury picked up in last month's 2-1 victory at Manchester City after being crunched by Fernandinho whilst Phillips was forced to sit out last weekend's 2-0 defeat at Brighton due to a minor knee injury.
However, Phillips and Raphinha were both captured in a video of United training posted on the club's official You Tube channel on Friday lunch time.
It remains to be seen if either are fit enough to start or even feature against Spurs.
A message from the Editor:
Leeds has a fantastic story to tell - and the Yorkshire Evening Post has been rooted firmly at the heart of telling the stories of our city since 1890.
We believe in ourselves and hope you believe in us too. We need your support to help ensure we can continue to be at the heart of life in Leeds.
Subscribe to our website and enjoy unlimited access to local news and information online and on our app.
With a digital subscription, you can read more than 5 articles, see fewer ads, enjoy faster load times, and get access to exclusive newsletters and content.
Click here to subscribe.
For more details on our newspaper subscription offers click here.
Thank you Laura Collins