Still no official confirmation from the club but he has tweeted this picture on his own social media account.
Middlesbrough's Albert Adomah has joined Aston Villa for an undisclosed fee.
The 28-year-old Ghanaian international leaves Teesside after three years at Boro and 143 appearances for the club.
Adomah made 43 appearances during Boro’s promotion winning season and has featured twice this term, his final appearance coming as a second half substitute during the 2-1 win at Sunderland 10 days ago.
The 20-year-old winger is the club's 11th senior signing of the summer.Read the full story ›
Sunderland AFC have completed the signing of the Gabon international Didier Ndong from French side Lorient, for a fee of 16 million euros.
Ndong joins the Black Cats on a five-year deal.
“I am very proud and happy to sign for Sunderland. This is a new adventure for me and to play in the Premier League is a dream come true.
“Maybe the Sunderland fans don’t know me yet, but I promise that they will quickly discover that I will give everything for them and the club. It will be an honour to wear the Sunderland shirt and I will wear it with a true understanding of what it means.
“I am excited to meet everyone at the club, to see the stadium and of course the fans, who I have heard so many good things about. Today is the most beautiful day of my life.”
- 22-year-old arrives on Wearside having made 46 appearances for the Ligue 1 team since joining them in January 2015.
- A right-footed central midfielder, he began his career at Tunisian outfit CS Sfaxien, where he made 40 appearances for the club before signing for Lorient.
- He has also been a mainstay in the Gabon side in recent years, with 18 caps for his country after making his debut for the national team in 2012.
Muzzy Carayol has parted company with Middlesbrough FC club after his contract was terminated by mutual consent.
Carayol has now joined Nottingham Forest on a two-year contract.
Carayol made just over 50 appearances for Boro, having joined the club from Bristol Rovers in August 2012, and scored 12 goals.
Sunderland has smashed its transfer record to bring in midfielder Didier Ndong from Lorient according to reports from France.
The Gabon international has signed a five-year deal with Sunderland for €20m (just over £17m) according to French sports newspaper L'Equipe
Sunderland's previous record was the £13m fee they spent on Asamoah Gyan from Rennes back in 2010.