Seattle Seahawks fullback Michael Robinson was in a pretty valuable position, because he's the only fullback currently on the Seahawks roster. So his injury early in the Seahawks-Niners game was pretty monumental and could have contributed to the huge first half struggles of the Seahawks.
NFL Network Insider Jason La Canfora reports that Robinson suffered a high ankle sprain, and could be out for as many as two months. Without Robinson, the Seahawks are going to have to seriously remodel the way they run their offense. The I-formation is probably shot, meaning Marshawn Lynch, Justin Forsett and Leon Washington will have that much more trouble running the football with out Robinson leading the way. It could mean more shotgun and more passing responsibilities for Tarvaris Jackson to bail them out, which is certainly not what head coach Pete Carroll would have wanted to do. The Seahawks will need a fullback fast.