"It depends. It depends on the moment, on the players, it depends on our needs".
Manchester United are preparing for the return to Premier League football after an FA Cup win against Derby County.
Their rapid rise in Guardiola's second season has heaped pressure on Mourinho as United have failed to match that progress.
Hammers boss David Moyes has previously worked with the Belgian at Everton and Old Trafford and is eager on another reunion.
The Red Devils are reportedly looking for a back-up option to Romelu Lukaku, with former Sweden international Zlatan Ibrahimovic back on the sidelines due to injury. Klopp encourages his players to be fluid, particularly in the final third.
Mkhitaryan has been linked with a move back to Dortmund but his boss did offer him some hope.
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Stoke will enter this match off the back of successive Premier League defeats to Chelsea and Newcastle United - where they conceded six times and failed to score.
Stoke City currently have the worst defence in all of top five European leagues.
This is slightly reminiscent of what happened with di Maria under Louis van Gaal, which led to the exit of the Argentine, a decision Jose derided when he took the job and now with a chance to do otherwise, he has gone down the same route he once sneered.
It has been a very poor campaign for the Potters, but they do boast a strong recent record against United.
Stoke City have gathered only four points from their last seven league outings. Also, the sure absentee will be center-back Eric Bailly. Most problems come from Stoke's poor midfield. In-form Anthony Martial and Jesse Lingard will join him, while Juan Mata is expected to get the nod over Marcus Rashford on the right of the attack. He joined in 2010 but was sold by Louis van Gaal in 2015 to Bayer Leverkusen. In fact, 2 of those goals came against Manchester United in the reverse fixture when Stoke halted the winning run of United by holding them to an entertaining 2-2 draw. That's the normal situation. I have been in that situation.
"In the way we play at Old Trafford, in the way we dominate opponents in the way we play in their box, I think Chicharito would have 20 goals easy", he said.
Stoke City's Erik Pieters (thigh) and Bruno Martins Indi (groin) are back in training, though caretaker assistant first-team coach Kevin Russell does not know if the defenders will be fit for Monday.