"The Nationals have reached a one-year agreement with right-handed starter Edwin Jackson, who traveled to Washington this afternoon to receive a physical, according to a person with knowledge of the deal.

Jackson, a hard-throwing 28-year-old, gives the Nationals a crowded rotation with seven qualified starting pitchers, but the they do not plan on making major changes to the complexion of their staff before spring training, a Nationals official said.

The Nationals could ultimately look to trade John Lannan or Ross Detwiler but do not plan to not trade either before the start of spring training, the official said. The official also described talk of Lannan being shopped as "overblown." "