Honduran midfielder Palacios has been training with the Union following his release from Stoke City this summer.
It remains to be seen whether Philly will sign Palacios on a permanent deal and head coach Jim Curtin has gone on to reveal that the club will make their decision on the midfielder within the coming week.
Curtin said: "Wilson's been in with us for about a week now. He's done well. He'll be here through Wednesday, we'll have to make a decision after that, but he's been good.
"He's a guy whose career speaks for itself at the international level in the World Cup. With Tottenham, with Stoke, he's a guy that's played at big clubs. We had in him for the week to take a look at him."