Mikel Merino the new player at Arsenal is very close to joining this team and starting playing for Arsenal in this season.
He had a good performance while playing for Real Sociedad but he left Sociedad and joined Arsenal for 39 million euros which is a good amount of money. Mikel Merino had medical tests recently and after that he is ready to officially join Arsenal. His contract will expire in 2028 and it can be extended for one more year.

A good signing for Mikel Arteta and Arsenal, he will bring good contributions to the team especially in the midfield and will help Odegard and other midfielders to help Arsenal create more chances in the team. I will be expecting Arsenal to give jersey number 8 so that Odegard will be using the jersey number 10 since Smith Rowe has left the team.
Arsenal finally recruited their second player this season I thought they were confident with the existing squad but it turns out Mikel Arteta continues to add ammunition to their front line to make it sharper, Mikel Morena was quite active when he was at Real Sociedad but last season he experienced a decline because he only created a few opportunities I hope his move to Arsenal will make his performance sharp again.
I think it doesn't matter what jersey number he uses, the most important thing is that he also becomes a reguler player for Arsenal because it would be useless if Arsenal bought him at a fairly expensive price but only used as a reserve player, for a 28 year old player I think 39 million euros is quite expensive.
You misunderstand the concept of Arsenal. They are confident with their team right now. But it is not an assurance that with that team they will win the premier league league. After all things can happen along the race, some players might fall injured and need replacement or any other casualties. That is the reason why Arsenal need Merino, as a substitute Midfielder who will in turn fill up the space where there is weakness in the team.
One thing I have realized in football and the buying of players is that all the players are important. Each of them has different talents and skills they can contribute to the team. They also have ideas and managerial input that may help the coach as well. I don't underestimate any player's capacity. Let's take a look at Mikel Arteta no one ever thought that in the past when he was still playing football he would end up being a very good coach.