In the worst kept secret of this transfer window, Alexis Sanchez moved to Manchester United from Arsenal in a swap deal with Henrikh Mkhitaryan on Monday night.

The 29-year-old Chile striker, who came close to joining Manchester City last summer, has signed what is believed to be a four-and-a-half-year contract that will make him the highest-paid player in the Premier League. It has been widely reported that Sanchez will earn a pre-tax salary of £500,000 ($695,000, 567,000 euros) a week. Armenia international winger Mkhitaryan, also 29, will head to the Emirates after he fell out of favour with United manager Jose Mourinho during 18 months at Old Trafford.

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Even before it was finalised, the deal had the attention of the media and fans and when it was finally announced - with the Chilean playing the piano to boot - it was trending all over social media.

From stats to jokes and digs, Twitter was full of emotions at the rare swap deal between two top clubs. Here’s a look

Some number-crunching

Not Sanchez, but his dogs will be missed

Then there is this

So many jokes

Alexis, the piano man