Ten days after free agency, the Lions still have two key positions to fill — starting safety and backup quarterback.

Shaun Hill, who has been with the Lions for four seasons, visited the St. Louis Rams on Tuesday, but left without a contract.

The Lions want him back and are still in the mix.

“Having Hill there as Matthew’s back-up the past few years has been important for us,” Lions president Tom Lewand said at an appearance on Monday night. “Having a good back-up — hopefully, it’s never necessary — but it’s an important insurance policy.”

If Hill signs with the Rams, the Lions will have to look elsewhere for a veteran backup.

Coach Jim Caldwell learned the lesson the difficult way about going into a season without a veteran backup. He was the Indianapolis Colts coach in 2011 when Peyton Manning couldn’t play. The Colts went 2-14 and Caldwell lost his job.

Kellen Moore is on the Lions’ roster, but he has never played a snap in an NFL game.

Safety James Ihedigbo, who visited the Lions facility a week ago is expected to sign. He played for new Lions defensive coordinator  Teryl Austin the last two seasons with the Baltimore Ravens.

Ihedigbo hired a new agent this week, so would expect a decision soon.

His price should be reasonable — he made $780,000 last season — and he started all 16 games for the Ravens so he’s a proven factor. The Ravens let him fly because they drafted first-round safety Matt Elam in 2013.

The 30-year-old Ihedigbo knows the defense. If the Lions draft one or two safeties, Ihedigbo could help with their development.

Like Golden Tate, who the Lions signed last week, Ihedigbo owns a Super Bowl ring.

(Follow @PaulaPasche on Twitter. Order her book,  “100 Things Lions Fans Should Know & Do Before They Die’’ here. It’s also available at bookstores.)