The extent of the injury is unknown, but hamstring injuries tend to linger. Cano has played through similar issues, so the addition of outside help may be unnecessary. But if the injury will cause Cano to miss time, the Mariners will need to bring somebody in to stem the tide.
Currently, the Mariners would role with Andrew Romine or Taylor Motter at second. Romine has had a nice spring, but has no track record of offensive success in the Majors. Motter helped carry the Mariners in Jean Segura’s absence in April of 2017, and could be asked to do the same in 2018.