Frank de Boer has confirmed that he will join brother Ronald in leaving Rangers in the summer.
Frank de Boer arrived at Ibrox in January
Defender Frank, who joined the Glasgow club in January, will be finishing his career in Qatar with his twin.
"I had promised my brother Ronald I would go with him to Qatar," de Boer told Uefa.com.
"That's more the issue than anything else. Maybe in my heart I wanted to stay but we made a pact to go at the same time and that is it."
The 33-year-old has won more than 100 caps for Holland.
He joined Rangers after an unhappy spell at Galatasaray in an attempt to get match-fit for Euro 2004.
"This was always going to be a big year for me as captain of Holland and I'm
grateful to Rangers for giving me the opportunity to restore my fitness and
confidence before Euro 2004," said de Boer.
The brothers will say farewell to the Ibrox fans in Rangers' last home game of
the season against Hearts on Wednesday night.