This will place pressure on Pascal Struijk to step into his role, and he only lasted 20 minutes when he did so at Aston Villa earlier in the season before being hauled off unceremoniously.
A lot of Leeds' commitment to attack relies on Phillips being able to stunt counters at source - Pascal will have a big task on his hands to fill the shoes left by the England international.
Leeds, though, will be aided by the potential return of Diego Llorente in the heart of defence alongside club captain Liam Cooper who saw minutes last week in the FA Cup.
Another would be striker Patrick Bamford. He has taken the top flight by storm this season, scoring 10 goals in 17 games.
Scroll down and click through to see how Bielsa's men could line-up as the squatter takes on the Potter.
1. Illan Meslier
The 20-year-old Frenchman is learning on the job. Had his critics but a very talented young keeper
2. Luke Ayling
The former Gunner is a versatile defender or midfielder but expected to start at right back for this one
3. Diego Llorente
The Spaniard is in line to return at centre back
4. Liam Cooper
The Scottish defender and Leeds captain i a vital member of the Leeds rearguard