Magath, who was fired by Schalke only three weeks ago and rejoined his former club Wolfsburg two days later, is famous for his tough training and discipline and was far from universally popular despite leading them to second place last season.
Several of his former players would be delighted to push him close to the second division as Schalke, who have won both matches under new coach Ralf Rangnick, host the relegation-threatened Wolves on Saturday.
Schalke are 10th with little to play for in the Bundesliga but according to striker Jefferson Farfan are treating Saturday's match like a final.
Wolfsburg, who won the Bundesliga two seasons ago under Magath, are in 16th place, the relegation play-off place, with 28 points from the same number of games and only goal difference stands between them and St Pauli, who are in the drop zone.
Farfan was repeatedly the subject of speculation about a move away from Gelsenkirchen but instead outlasted the coach despite a turbulent relationship.
"The psychological pressure of Mr Magath has gone and now we are enjoying ourselves again at Schalke," the Peruvian told Sport Bild. "Until recently, a lot of players lived in fear.
"The new coach is trying to construct a relationship of faith with the players.
"The problems between Mr Magath and myself were undeniable. The time under Magath was a huge strain psychologically."
Schalke's team against Inter Milan included two players, Hans Sarpei and Alexander Baumjohann, who were banished to the reserves by Magath earlier in the season and both are expected to line up on Saturday.
Magath, whose nickname Quaelix is a mixture of his first name and the German word for torture, had claimed the pair were not working hard enough in training.
"You never forget," Ghanaian Sarpei told reporters after the Inter match.
"Football is about ups and downs. I have played well under the new coach and we've won two games."
"I didn't have an easy time under Magath, but Rangnick has talked to me along and built me up again," said 24-year-old Baumjohann, who was a bright teenage prospect during Rangnick's first stint at the club five years ago but has failed to progress as expected.
Rangnick has brought both back into the team as well as striker Edu, who was rarely used by Magath and tended to play on the wing.
On Tuesday, Rangnick used Edu as an out-and-out centre forward and the Brazilian repaid him with two goals as Schalke virtually guaranteed a place in the semi-finals.
Magath said there were no hard feelings on his part.
"Of course, I watched the game and I was very happy for the team," he told DPA news agency after watching the Inter game.
Borussia Dortmund, seven points clear at the top, visit seventh-placed Hamburg while second-placed Bayer Leverkusen host St Pauli on Sunday.
Dortmund and Leverkusen, seven points
‘The pure simplicity of the way Slot has managed the squad is probably the biggest thing I could say about him. It’s not broken, so let’s get on with it’: Liverpool legend full of admiration for Jurgen Klopp's successor at Anfield
‘I trained at Spurs and thought they’d give me a chance. But I received a letter thanking me but saying they didn’t think I was good enough – I was gutted’: How Tottenham missed out on signing Wales legend John Toshack
