Not a day goes by without Arsenal surely ruing letting Serge Gnabry go in the summer of 2016.

Sold for just £5m to German side Werder Bremen, Gnabry has since blown into superstardom, becoming a star at both club and international level with Bayern Munich and Germany, respectively.

The forward, now 25, is currently lighting up the Bundesliga with Bayern, and has already scored nine goals and provided a further three assists in just 22 games in the league this season.

With Germany, Gnabry's record is even more impressive netting 15 times in just 19 senior games, and that's a real testament to how much he's grown over the years.

Speaking just last summer, Arsene Wenger - the manager who of course sold him back in 2016 - delivered his verdict on the winger and the situation behind his surprising exit, saying: "We had an agreement with him you know. I had given him out on loan to West Brom and he didn't play a game. He came back, he was injured. We worked very hard with him for six months and he went out with the German national team, under-21's, and Bayern made a deal with Werder Bremen.

"He wanted to sign in the end, didn't want to extend his contract (with Arsenal) and I was very sad. But we couldn't get over the line with him because I knew he would have a great career."

Now, CIES value him at a massive £102m, more than twenty times what Arsenal actually sold him for a few years ago - if there ever was a move that underlined the kind of bad business the Gunners have done in recent seasons, then Gnabry is arguably right there at the top of the list.

Gnabry has become an established star shining at the very highest level, even helping Bayern to Champions League glory just last league - a run that saw the German winger tear apart Tottenham in their new stadium by netting four in a thumping 7-2 triumph.

Arsenal will surely never be able to live down letting Gnabry go.