Magilton himself has denied any wrongdoing but admits the pair shared "a difference of opinion".
Gallen was in joint charge with Marc Bircham for the first time on Monday night at The Hawthorns as Rangers were denied a headline-grabbing victory at high-flying West Brom by Simon Cox's 94th-minute equaliser - a goal which salvaged a 2-2 draw for the hosts.
But an in-the-dark Gallen pointed to media reports a decision at Loftus Road could be made over the next 48 hours.
"I don't know what is going to happen," he said. "I just got told last week, and it feels like the longest week ever, that I would be in charge for this game.
"I don't know if I'm charge for Saturday's game (at home to Sheffield United).
"I don't know when I'll find out. I saw something on Sky Sports yesterday and it said the club are meeting with Jim and something will be decided over the next 48 hours.
"I welcome that, definitely. I'm sure people on the outside at QPR want to see things resolved quickly - we all do on the inside."
He added: "I also saw some things during the week about chaos at QPR - that's absolute nonsense. I've not seen any chaos at the training ground."
Albion dominated an uninspiring first half in the Black Country but for all their possession they were left to rue a lack of conviction in the final third.
The start of the second half continued in much the same fashion until the visitors took the lead very much against the run of play in the 56th minute.
Under pressure from Kaspars Gorkss, Baggies centre-back Jonas Olsson could only divert a header into his own net.
Dean Kiely superbly tipped Adel Tarrabt's 25-yard strike onto the woodwork before his failure to deal with Ben Watson's free-kick led to Gorkss heading a second for a visiting side who were in dreamland.
But despite being under pressure from a restless home crowd, West Brom rallied and immediately hit back through Jerome Thomas's sixth league goal of the season.
Chances came at either end and both Kiely and Radek Cerny were called upon to produce great saves.
But with QPR heading towards their first win at The Hawthorns since October 1999, Cox popped up to fire home a late equaliser after Cerny could only parry substitute Chris Wood's effort. Speaking about the game, Gallen added: "I think we've dropped two points, it feels like a loss.
"We were 20 seconds away from winning the match. When you're 2-0 up you feel you deserve to win.
"Did we pass the ball as good as West Brom? No. Did we have as much possession as West Brom? No. But that was the game plan, to sit in and be disciplined, patient and organised."
The late equaliser ensured second-placed Albion did not go down to back-to-back home defeats and left them four points clear of the chasing pack.
Manager Roberto Di Matteo said: "The way the game went a point is better than nothing. I'm trying to look at the positive side of it.
"The players fought really hard for the point. I thought we deserved a little bit more as well, we had some very good chances but didn't quite manage to score.
"We've definitely been leaking too many goals in the last three games."