There's already an Alexandre Lacazette v Romelu Lukaku Twitter war between Arsenal and Manchester United fans

As we all know by now, Rule No. 1 when it comes to supporting your team on the Internet is to always back them to the hilt. No matter what.

So if that means you have to go in to bat for your club's new star striker before they've even played in a competitive match for you, then that is what you will do. And how.

Which brings us to supporters of Arsenal and Manchester United , who are doing just that with Alexandre Lacazette and Romelu Lukaku right now.

The pair - who cost £127m between them - are likely to be the headline arrivals at both clubs this summer, and after it was revealed that Jose Mourinho's scouts didn't think much of Lacazette before the Portuguese was convinced to go for Lukaku, fans of both Arsenal and Manchester United have been at odds with each other about the pair on Twitter.

Yeah, fans arguing with each other on Twitter!

What a world.

There have been some questionable figures thrown around...

Bold predictions are being made

The players' records are being questioned

As are the words from the Manchester United boss

It's going to be a long season, friends...