10:08am: The Twins are unhappy with the Nationals' offer, Rosenthal reports (on Twitter). Meanwhile, the Nationals are worried about Span's concussion.
FRIDAY, 9:23am: Talks between the Twins and Nationals are ongoing, according to Jon Paul Morosi and Ken Rosenthal of FOX Sports. Span and Storen are at the center of discussions, with Roger Bernadina and others in play. The Nationals aren't talking exclusively to the Twins as they search for a center fielder, but Span appears to be high on their list of targets.
THURSDAY, 12:52pm: The Nationals are not willing to trade Storen for Span, reports MLB.com's Bill Ladson.
WEDNESDAY, 3:20pm: The Nationals continue to target Span, tweets Ken Rosenthal of FOX Sports, and Storen may be in play.
MONDAY, 2:03pm: The Nationals have talked to the Twins about Span, reports Ken Rosenthal of FOX Sports. The Nationals are unwilling to trade Drew Storen or Tyler Clippard, though Rosenthal feels Ian Desmond could be of interest to the Twins.
1:30pm: Twins center fielder Denard Span is high on the Nationals' list of targets, reports Amanda Comak of the Washington Times. Span would fit the team's desire for a controllable center fielder/leadoff hitter, assuming there are no ill effects from a concussion suffered in June.
Span, 27, is hitting .294/.361/.385 on the season in 255 plate appearances. His center field defense has been a plus in recent years, according to UZR. His team-friendly contract has less than $15MM remaining through 2014, plus a club option for '15. It's not known whether the Twins consider Span expendable; Ben Revere has a .249/.287/.284 line filling in. The asking price would surely be significant.