because of a tendon injury in his right foot.The move means the NFC North-leading Bears (4-3) will be without Long for at least eight weeks.The three-time Pro Bowl lineman was injured in the closing minutes of the Bears' 24-10 victory over the New York Jets last weekend. Tight end Dion Sims rolled into Long while the two were blocking for Jordan Howard on a run.Chicago visits Buffalo on Sunday. Tight end Ben Braunecker (concussion) and defensive tackle Bilal Nichols (knee) did not travel with the team Womens Customized Chicago Bears Jerseys , and star linebacker Khalil Mack (ankle) and receiver Allen Robinson (groin) are questionable.With Long out, the Bears could move Eric Kush or rookie James Daniels from left guard, where they have shared time. Kush missed the game against the Jets because of a neck injury but is expected to play against Buffalo.Another option at right guard is Bryan Witzmann. He signed with Chicago 3 1/2 weeks ago and made 13 starts last season for Kansas City while coach Matt Nagy was the Chiefs' offensive coordinator.The 29-year-old Long made the Pro Bowl his first three seasons after being drafted in the first round in 2013. But he missed eight games in 2016 and six last season after playing in 47 of a possible 48 from 2013 to 2015.Nagy has said the latest injury was not the same as the severe one to his right ankle in 2016 that required surgery. Long also had operations on his shoulder, elbow and neck after he was shut down last year.Recap: The Bears officially introduce Khalil Mack Khalil Mack is a Chicago Bear. You know that. Now read it again. Khalil Mack is a Chicago Bear.Still not registering?Khalil Mack is a Chicago Bear.Has the reality set in yet? If not, you better prepare yourself. The fun is about to begin.Mack is being officially welcomed to Chicago by the Bears today at Halas Hall. A blockbuster trade needs a blockbuster welcome, after all. A tone-setter and generational superstar deserves the best the Bears have to offer. Here at Windy City Gridiron, we’ll have full coverage of the press conference for the Bears’ new face of their defense. You can’t let up in moments like these. Trading for Mack not only sent shockwaves around the NFL, but it made the Bears relevant again. It put them back on the map. Khalil Mack is a Chicago Bear.One more time. Khalil Mack is a Chicago Bear.Here’s a link to the Bears’ stream of their introduction of Mack on their website. And here’s the Twitter link of the presser. In one of the more momentous days in Bears franchise history www.bearscheapstores.com , a day after they pulled off a coup for Mack, you could sense a palpable energy at 1920 Football Drive. Most importantly, you could sense Mack - fresh off his contract extension with Chicago - itching to get back to work amidst all the excitement. After missing the entire preseason due to his holdout with the Raiders, you’d forgive Mack if he wants to get past the formalities and start learning the Bears defense as soon as possible. Why is Mack enticed by what the Bears have to offer, beyond anything on the field? They showed an interest in paying him what he’s worth. A novel concept that isn’t difficult to understand. In missing the preseason, is the veteran Mack concerned about not being effective enough against the Packers next Sunday night? Not in the least, so stop wringing your hands. Joining the Bears is even easier for Mack when they not only have a coach to be excited about in Matt Nagy, but a roster ready to win now. That defensive roster for Chicago is obviously what Mack notices first. A group of “dogs” as he said Chicago Bears T-Shirt , and a far cry from the shell of the Raiders’ defense. It’ll be nice to play with Akiem Hicks and Leonard Floyd. Is there any pressure on being the NFL’s highest-paid defensive player? Yes, and Mack is prepared to live up to the hype. A thought from Mack that his father adamantly agreed with. That pride is something Mack couldn’t take too far, however. It’s nice to mold these two together after competing against one another, isn’t it?All of this is too much for Mack. It’s time for football to speak first. Aaron Rodgers and the Packers await. After Mack left the podium, Bears general manager Ryan Pace and Nagy came to speak about the acquisition of the superstar.In an interesting tidbit, the seeds of a Mack trade went back as far as before training camp began for the Bears in mid-July. You have to explore every option if you’re Pace.There is such a thing as positional value, and Pace puts a lot of emphasis on it. Mack plays football’s second-most important position, and the aggressive Bears had to acquire him.Pace isn’t concerned about the lack of draft capital for the Bears in the near future. The best way of looking at it is that they just acquired a future Hall of Famer as their first-rounder in 2019. Everything will take care of itself. For as much as Mack believes he can go out and dominate right away despite missing August Chicago Bears Hats , Nagy knows the Bears have to be more cautious with him to start. Oh, and about those raised expectations with Mack’s addition? They didn’t have to be raised because they were already so high. It’s always been Super Bowl or bust for the Bears. Mack makes that fact more prominent.Robert is an editor, writer, and producer for Windy City Gridiron, The Rock River Times, The Athletic Chicago, and a host of other fine publications. You can follow him on Twitter @RobertZeglinski and reach him by email at firstname.lastname@example.org.