Arena stepped down earlier this month after the U.S. failed to advance to next summer's World Cup, losing its final qualifier to Trinidad and Tobago.
Sarachan, 63, coached under Arena at the University of Virginia, with
But the Fire struggled after that and Sarachan was relieved of his duties midway through the 2007 season. A year later he was reunited with Arena on the Galaxy staff, helping the team to eight straight playoff appearances and three
Sarachan will be assisted in the Portugal match by the rest of Arena's national team staff, including Ken Arena, Pat Noonan and Matt Reis. All four men remain under contract to U.S. Soccer through the end of the year.
The game with Portugal, the reigning European champion, will be played Nov. 14 in Leiria, Portugal.