Nathan (centre) is being tipped to be the next big thing in South American footballReuters

Chelsea have officially announced the signing of Atletico Paranaense midfielder Nathan for a transfer fee believed to be around €6.2 million.

The 19-year-old midfielder, who is being tipped to be the next big name in South American football, had earlier confirmed the move to Stamford Bridge via social media, posting pictures of himself signing a contract at Stamford Bridge on his official Instagram account.

And now the Blues have also officially announced the signing via their official club website.

"Chelsea Football Club is delighted to announce we have agreed terms with Atletico Paranaense for the transfer of Nathan," read a statement in Chelsea's official website. 

The statement further added that the Brazil Under-20 international, who has successfully undergone the medical tests and agreed on personal terms, will be moving to Stamford Bridge when the summer transfer window opens on 1 July.

"The 19-year-old Brazilian will join us on 1 July. Nathan, who has passed a medical and agreed personal terms, has earned a reputation as an attacking midfielder with an eye for goal and impressive pace."

Nathan, who was named the player of the tournament in the Under-17 World Cup in 2013 after scoring five goals in five games for Brazil, expressed his delight at having signed for the newly crowned Premier League champions.

"I am very happy to be joining Chelsea, the champions of England, and I hope I will be able to learn a lot and develop my game," he told the Blues' official website.

Meanwhile, Wolfsburg's Andre Schurrle says that he is feeling very happy to be invited by his former side Chelsea to watch their final league fixture against Sunderland and collect the Premier League winners' medal on 24 May.

Although the 24-year-old completed a £22 million switch from Chelsea to Wolfsburg in January, he is still eligible to receive a Premier League winners' medal as he made 14 appearances for the Blues this season.

And the German says he is feeling very happy after being invited by Chelsea manager Jose Mourinho to collect his winners' medal on 24 May.

"Jose Mourinho sent me a text to say that I'd get a medal and he asked me to come to the last game (against Sunderland on May 24). That was very nice for me," Schurrle told BBC World Service's World Football programme.

"I'm really happy for the boys. They played a very good second half of the season so of course for me it's good to get a medal but the boys did the work.

"I had the World Cup which was very perfect for me and the start of the season was good as well," he added.