And two big games in quick succession have underlined he is fit and ready to do his bit for Albion.
The midfielder was a big part of Sweden’s successful progress to the World Cup finals via play-offs.
They beat Ukraine and then, in dramatic fashion, Poland after Ayari’s deft back-helped create a goal.
Graham Potter was recently handed a four-year contract extension in charge of a Sweden side who had endured a dismal qualification campaign.
They always knew they had the safety net of a play-off path thanks to their UEFA Nations League performance and they duly seized it.
Ayari told The Argus: “I think it was one of the best experiences I have ever had when it comes to football.
“I was just happy for my country. It's always something big to achieve something like this for your country, and playing in front of a sold-out stadium, the atmosphere was top.
“So the feeling was unbelievable.”
Ayari, 22, said the responsibility on players’ shoulders was “huge” but highlighted how Potter helped them handle it.
He said: “You need to have the responsibility to represent your country and then, obviously, we didn't do as good in the qualification round, so we had a bit of pressure because this is the last chance for us to qualify to the World Cup.
“And with this team we have, with the talents coming up now, the new generation, so called, we had a bit of a pressure.
“But we enjoyed it because we know how good we are as a team and Graham came in and made us feel comfortable with being in this environment and having the pressure on us.
“He just made sure that we are staying together.
“We have a good connection with everybody and just embracing the moment because it's a privilege to represent your country and at this stage as well.
“So just enjoy every moment.”
Ayari’s parents are from North Africa but he was born and raised in Sweden.
So, while there was a decision to make in terms of which nation he represented in international football, it was never a really a big one.
He said: “It was a decision to make but, in my mind, it was always going to be Sweden, because when I was growing up, I always played for the youth national teams in Sweden.
“I had a decision from Morocco and Tunisia but I chose Sweden because it was the most natural thing for me.”
Albion fans enjoy seeing their players do well for their country – even if one of them scores the winner against England at Wembley.
They might even like one or two more to have the chance to shine this summer.
There can also be fringe benefits for the club.
Ayari has had precious little action for his club after suffering a dislocated shoulder in late January.
So two highly demanding international matches, in which he played 77 and 89 minutes, can only help him with regard to the Premier League run-in.
He confirmed: “I'm healthy. I played two games now in a short period of time, just coming back from injury, so I feel good.”