WASHINGTON -- When manager Mike Quade noticed Marcos Mateo shaking his hand after a 3-2 pitch to Jayson Werth on Monday, he wondered what was going on.

When he visited the mound one pitch later, he knew. Mateo injured his elbow, and it is serious enough to warrant an MRI, most likely in Chicago. Quade did not know the extent of the injury when he met with the media after the Cubs' 5-4 loss to the Nationals, but appeared prepared for a difficult prognosis.

Mateo will be placed on the disabled list, according to the Chicago Tribune.

"No, [it didn't look good]," Quade said. "We'll find out about that in due time. I don't know if [I'll need another reliever] ... but we may."

Mateo faced two batters in the 10th inning at Nationals Park, walking Werth and allowing pinch-hitter Livan Hernandez to sacrifice Werth to second. Carlos Marmol took over for him and allowed Werth to score on a wild pitch, but Mateo took the loss.

The Cubs have to make a roster move to create room for Ramon Ortiz, who will start Tuesday. Casey Coleman, who Chicago recalled from Triple-A Iowa to start Monday could also stick around, but Quade would prefer he gets regular starts.

But there will be a roster move Tuesday, and Mateo suddenly became an option.

"Given what just took place and everything else, we have to find a spot, and maybe it's even easier now," Quade said.

Dempster day to day, likely to start in Pittsburgh

WASHINGTON -- Manager Mike Quade maintained Ryan Dempster will make a start on Chicago's road trip to Washington and Pittsburgh before the All-Star break, but the right-hander remains day to day after a Saturday night hospital stay.

Dempster's core is bothering him, and Quade believed it is a product of intestinal issues, but admitted, "I'm not smart enough to know all that."

His status is unchanged, but as soon as Dempster feels better playing catch and throwing off of a mound, he could be back in the rotation.

"Each day is just trying to get him more loose and more mobility," Quade said.

Quade did not completely rule out a start in Washington, where the Cubs play until moving on to Pittsburgh on Friday, but he does not to want to move Randy Wells and Matt Garza from their scheduled starts Wednesday and Thursday.

Ramon Ortiz is scheduled to start Tuesday in Washington, but is not on the active roster. The Cubs' corresponding move to activate him will likely depend upon Dempster's health and whether they need Coleman to stick around after his start.

"If [Dempster] feels fantastic, we have to start thinking about what we want to do," Quade said. "[A start in] Pittsburgh is probably more likely."

Nationals Park brings back memories for Quade

WASHINGTON -- When manager Mike Quade entered the visitors' dugout at Nationals Park on Monday, he paused to see if anything changed since he was last there.

One thing he hopes remains unchanged is the Cubs' results in Washington. Quade made his managerial debut at Nationals Park on Aug. 23 last year and won, 9-1, en route to a three-game sweep. Casey Coleman, who the Cubs recalled from Triple-A Iowa to start this series opener, picked up the win in Quade's debut.

"This game is a weird deal sometimes," Quade said. "It probably holds some significance for me, but I was glad Casey pitched well and ended up being the start of a really nice finish."

Coleman received the call Monday to start in place of Ryan Dempster and made eight starts earlier this season. He has a 7.78 ERA this season, but threw 6 1/3 innings of one-run ball last year in his first Major League win.

"It was a relaxing win," Quade said. "I literally watched him pitch, ran some bullpen guys out there and had a nice, easy opening win."