Rangers have signed experienced Dutch defender Frank de Boer until the end of the season.
Frank de Boer trained at Murray Park on Monday
De Boer's twin brother, Ronald, has been at Ibrox since 2000 and has been a big success in Scotland.
De Boer moved to Galatasaray in the summer, after rejecting overtures from Blackburn Rovers, but the Turkish side were keen to offload him.
"I'm happy to join my brother again. We were together for nine years at Ajax and two at Barcelona," de Boer said.
The 33-year-old said he hoped the move could help him regain his best form ahead of Euro 2004.
"I want to play in Portugal and I want my international career
for Holland to end well," he said.
"To do that, I'll need to be playing and get to the level I'm used to and, hopefully, I can do that at Rangers."
De Boer, the most-capped player in Dutch history, added he might stay at Ibrox permanently.
"After the four months, I will decide what to do then, but everything is open," the 33-year-old said.
But Rangers boss Alex McLeish said a decision on de Boer's future at the club could wait until the
end of the season.
"That depends on Frank and Rangers," he said.
"If he makes an impact in the next four months, we will speak to him at the end of the season.
"But it is up to Frank as well."
De Boer made the last of his 108 international appearances in the 6-0 Euro 2004 play-off win over Scotland in November.
After falling out of favour at Galatasaray, he was anxious to find a club in order to stay in shape for the European Championship finals in Portugal this summer.