Soccer

Martins confirms China move in emotional Twitter post

Sep 19, 2015; Vancouver, British Columbia, CAN; Seattle Sounders forward Obafemi Martins (9) awaits the start of play against the Vancouver Whitecaps during the first half at BC Place. The Seattle Sounders won 3-0. Mandatory Credit: Anne-Marie Sorvin-USA TODAY Sports

Sep 19, 2015; Vancouver, British Columbia, CAN; Seattle Sounders forward Obafemi Martins (9) awaits the start of play against the Vancouver Whitecaps during the first half at BC Place. The Seattle Sounders won 3-0. Mandatory Credit: Anne-Marie Sorvin-USA TODAY Sports

Obafemi Martins' exit from the Seattle Sounders is all but official.

The Nigerian striker tweeted a farewell letter to Seattle Sounders fans Wednesday, confirming he will sign with Chinese side Shanghai Shenhua. News of Martins' impending move was reported earlier this week, and the 31-year-old was spotted arriving in South Korea on Wednesday for the club's preseason camp:

Thanks to all who made these last three years an amazing experience. Seattle has a special place in my heart 💚💙 pic.twitter.com/qg3XxYRzbK

— OBA MARTINS (@Obafemimartins) February 18, 2016

More from FoxSports

"For me it's now time for a new challenge," Martins wrote. "After significant reflection, I have decided to join Shanghai Greenland Shenhua FC of the CSL."

Martins leaves the Sounders after three campaigns in MLS, having recorded 40 goals and 23 assists over 72 regular season appearances. He enjoyed his finest season in 2014, notching 17 goals and 13 assists while earning a spot on the shortlist for MLS MVP.

Sounders general manager Garth Lagerwey said in an audio statement released by the team Sunday: ''Obafemi's not here with us in this phase of camp. We've had an approach from a Chinese club for his services.''

Information from The Associated Press was used in this report.