The Mariners have lost jack-of-all-trades utility player Jack Hannahan for at least the next seven days to a strained right groin.

Hannahan, the leading candidate to be the backup infielder, sustained the injury while making a play on March 4 in the Mariners’ charity game against the Padres.

“He had an MRI, which showed a mild strain,” manager Don Wakamatsu said this morning after meeting with team medical director Dr. Ed Kalfayan and head athletic trainer Rick Griffin. “We’re looking at seven to 10 (days) right now.”

Hannahan will have complete rest and treatment for the next three days and then gradually work his way back.

How quickly he recovers will determine his status for the 25-man Opening Day roster.

Hannahan, acquired from the Athletics last July 11, batted .230 (51-for-148) with three home runs and 11 RBIs.

And here is today’s starting lineup against the Royals.

1. Ichiro, RF
2. Chone Figgins, 2B
3. Milton Bradley, LF
4. Ken Griffey, Jr., DH
5. Ryan Garko, 1B
6. Franklin Gutierrez, CF
7. Matt Tuiasosopo, 3B
8. Josh Bard, C
9. Jack Wilson, SS

P. Ryan Rowland-Smith

— Jim Street