Phoenix head coach Ernie Merrick said Boyd had been keen move to Europe.
“We have known for some time that Tyler wanted to play in Europe and I wish him all the best for the future,” Merrick said.
The young striker made his debut with the Wellington Phoenix against Sydney FC in 2012 at the age of 17.
He scored two goals in 20 appearances for the Capital city club in the 2013/2014 season and was made club’s U23 player of the year.
Tyler Boyd is currently leading the top scorer rankings in the New Zealand ASB Premiership with the Wellington Phoenix reserve with 10 goals.
On the international side, he appeared at the 2013 OFC U-20 Championship in Fiji helping the Junior All Whites qualify for the 2013 FIFA U-20 World Cup in Turkey. He made his international debut with the All Whites last year in a friendly game against Japan in Tokyo.
Boyd, 20, was part of the Phoenix’ first intake to its Football School of Excellence and was signed on a three-year professional contract.
The Portuguese team currently sit at fifth place in the Primeira Liga.
For more visit www.wellingtonphoenix.com.