Utility man Mark DeRosa will join the Nationals in Colorado today and “probably” be activated from the 15-day disabled list for tonight’s game against the Rockies, a person familiar with the team’s plans said.

The corresponding roster move is not yet known. The two most likely choices appear to be designating veteran outfielder Xavier Nady for assignment or optioning rookie Tyler Moore back to Class AAA Syracuse. Moore has out-performed Nady recently, but sending him down would allow the Nationals to keep both players in the organization.

DeRosa has been on the DL since April 28 with a strained left oblique. As he rehabbed from the injury, DeRosa also dealt with the death of his father after a long bout with cancer. Yesterday, DeRosa finished 1 for 11 with four walks and three strikeouts in his rehab assignment at Class A Potomac.

DeRosa is a veteran who can play both corner outfield spots and both corner infield spots. Manager Davey Johnson could use DeRosa at third base in case Ryan Zimmerman requires rest for his aching shoulder. Before his injury, DeRosa hit .081, mostly coming off the bench. Johnson values DeRosa for his versatility, experience and positive effect on teammates.

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