Don't quite understand why Arsenal fans are celebrating this.
You're now left with a player who is devastated that this transfer didn't go though. Sanchez wants nothing to do with the Arsenal's future and will be leaving for free in 10 months.
One of your two main attacking threats will be disgruntled with one eye on where he is going next season.
Your team is still the same team that got absolutely humiliated by Liverpool. The same Liverpool that The Ox joined, taking a significant pay cut to join and get away from your club.
Your club made a bid for Lemar, and depending on which story you believe, Arsenal (a) had bid accepted not thinking that it would be, only bidding to appease fans by looking like you were trying, and then cancelled the transfer when it was accepted as you had no intention of following through (b) had the bid accepted and Lemar wisely straight up rejected to have anything to do with your shambles of a club this season.
You're in the middle of a terrible start to the season, let's not forget that you should have lost to Leicester too if not for your handball leading to a goal, and that would have been 3 losses out of 3. This is off the tail end of your worst league position since 1996, for this you've rewarded the manager with a new 2 year deal at an increased wage.
This same manager that the majority of your fan base want out and have no support for. You have important players who are refusing to commit to your clubs future. Sanchez, Ozil, Mertesacker, Wilshire, and Cazorla are all free agents at the end of the season. If all these players leave for free (or even half of them, which is extremely looking like the case) that will be a large part of the arsenal 2018 transfer money that will have to be spent to replace them, and we all know that Arsenal aren't good at bringing in new players.
Sanchez will be gone at the end of the season, maybe to us, maybe somewhere else, but your club as pissed away £60m in what is an embarrassment. £60m that Arsenal shouldn't be willing to let go, because of your failure to achieve Champions League and won't be close to getting back in again this season.
There is not a single thing that Arsenal fans should be celebrating today.