(Portland, OR)  --  The Timbers are adding some reinforcements to their back line.  The team has officially signed Congolese center back Larrys Mabiala.  The Timbers have been shorthanded since staring center back Gbenga Arokoyo went down with a season-ending injury in preseason.  Mabiala has made 201 professional appearances for four different teams since 2007.  He also has nine appearances for the Democratic Republic of the Congo National Team.