Arsene Wenger played down Alexis Sanchez's frustration at being substituted in Arsenal's easy victory at Swansea.
Sanchez had scored Arsenal's fourth goal before being withdrawn 11 minutes from time with the Gunners moving into the top three on goal difference.
The Chilean responded to his substitution by kicking his gloves on the touchline.
"All the players are frustrated when they come off, some show it, some not," Arsenal manager Wenger said.
"I'm long enough in the job to know that. I just make the decision I feel is right, that's it. He (Sanchez) is a good guy who gives a lot.
"I don't look at that. I look at how well the players do that come on, how comfortable they are, because Danny Welbeck has not played for two years.
"That's much more important for me than an individual response. That is vital when a player 25 years of age, who is a regular in the national team, comes on, you have an opportunity to give him game time."
Sanchez shone in the second half as Arsenal, 1-0 up at the break through Olivier Giroud's fifth goal in as many matches, turned on the style.
Two deflected Alex Iwobi shots, which were credited as own goals to Jack Cork and Kyle Naughton, and a Sanchez volley secured Arsenal's first league double over Swansea since the 1982-'83 season.
With Hull beating Bournemouth, Swansea dropped bottom of the table and their next five fixtures include games against Liverpool, Manchester City and Chelsea.
But Swansea head coach Paul Clement, who was in charge of a Premier League game for the first time, insists the manner of the Arsenal defeat has not changed his view on the challenge ahead.
"Everyone knows the task at hand is a very hard one but we're all up for it," said Clement, who confirmed the signings of Norwich defender Martin Olsson and Tottenham midfielder Tom Carroll are waiting on medicals and paperwork.
If Mauricio Pochettino found it "difficult" to say that this win over West Brom was the best performance of his two-and-a-half years in charge of Tottenham Hotspur, it did make one grand claim very easy to say: his team are once again title contenders, and could well be even more dangerous than last season, especially with new father Harry Kane scoring hat-tricks like this.
The nature of the modern Chelsea is that even in the calmest waters the next storm is never too far away and yet the first player rebellion of Antonio Conte's reign at the club was not permitted by the Italian to derail a Premier League title bid that is firmly back on track.