In an MLB Network Radio interview with Jim Bowden and Casey Stern last week, Washington Nationals' GM Mike Rizzo talked about signing right-hander Casey Janssen this winter. Rizzo discussed the illness last season (food poisoning) that allowed the Nats to get the 33-year-old, eight-year veteran who saved 81 games over the last three of his eight seasons with the Toronto Blue Jays on a relatively modest 1-year/$5M deal.

"He had a hiccup with the second half of last year, and if he doesn't we don't have him right now at the price we got him for." -Mike Rizzo on Casey Janssen on MLB Network Radio

"He's been healthy pretty much throughout his career," Rizzo said. "He had a hiccup with the second half of last year, and if he doesn't we don't have him right now at the price we got him for."

"This is a guy that had a middle-1.00 ERA the first half of last season. All-Star-caliber numbers and then had a poor second-half."

Janssen put up a 1.23 ERA in 22 IP in the first half of the 2014 campaign, saving 14 games and holding opposing hitters to a combined .217/.226/.265 line.

After returning to action following the All-Star break and the food poisoning, the Jays' reliever put up a 6.46 ERA in 23 ⅔ IP over which opposing hitters had a .287/.343/.526 line.

Rizzo said he was comfortable with the signing though, and looking forward to a strong season from Janssen.

"We like the makeup of the kid," Rizzo explained. "We did a lot of research and a lot of work like we do on all the guys we get, with his makeup. He's a warrior. He's a tough guy on the mound. He's a guy that's not afraid. He throws the ball over the plate and he's got the stuff to finish off games. So, again, gives us some insurance in the ninth. Gives us an option in the eighth and a guy who will take the ball in any and all situations."

This afternoon, however, Nats' skipper Matt Williams told reporters in Viera, Florida's Space Coast Stadium, where the Nationals beat the Marlins, that Janssen is headed for an MRI on his right shoulder tomorrow after experiencing soreness in the shoulder and having trouble getting loose:

Casey Janssen is getting an MRI on his shoulder, per Matt. He reported soreness outside the ordinary & trouble getting loose last outing. — James Wagner (@JamesWagnerWP) March 29, 2015

Casey Janssen getting an MRI on his right shoulder tomorrow. Has had trouble getting loose, per Matt Williams. — Mark Zuckerman (@ZuckermanCSN) March 29, 2015

Janssen began feeling discomfort in his right shoulder when he was warming up before his last appearance. #Nats — Chris Johnson (@masnCJ) March 29, 2015

Is Roark a lock for the Nationals' 'pen? Photo © Brad Barr/USA TODAY Sports

The shoulder issue for Janssen is just the latest injury concern for the Nationals, who've dealt with injuries to outfielder Jayson Werth (shoulder surgery), Denard Span (core muscle surgery), Ryan Zimmerman (bruised side), Yunel Escobar (oblique), Drew Storen (hamate bone surgery) and Anthony Rendon (MCL sprain) already this Spring.

"'The last time out, he started to feel it,'" Williams told reporters, including NatsInsider.com's Mark Zuckerman.

"'He had a little trouble getting as loose as he wanted to get. So we’ll see where he’s at.'"

They'll find out the extent of the issue with Janssen's shoulder tomorrow...

In six innings pitched this Spring, Janssen has given up six hits, two walks and three earned runs while striking out five.