Louis Delmas could test the free agent open market, but maybe the Detroit Lions safety is close to a deal to stay in Detroit.

 He was flown into Detroit for a physical today, per ESPN’s Adam Schefter.

 Delmas is a key part of the Lions’ defense when he can stay on the field. He missed 13 games in the last two seasons combined due to knee injuries.

 In 2012 he missed most practices to keep the knee as fresh as possible for game days.

 Delmas brings a certain energy to the defense when he’s in the game — not just to the defensive backfield but to the unit as a whole. He’s definitely a vocal leader and if he’s healthy, a huge asset.

 Will be interesting to see where this goes.

 Free agency opens at 4 p.m. on Tuesday.

 While general manager Martin Mayhew told reporters at the Combine that he had targeted nine of the Lions’ 23 potential free agents, only two have been signed to this point. Offensive tackle Corey Hilliard and outside linebacker DeAndre Levy have agreed to new deals.

 Cliff Avril, Chris Houston and Delmas are among the big question marks.

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