Back in February, during the combine, Matthew told the media "I'm going to make it as hard as I can on coaches to try to keep me off the field." From training camp reports, it sounds like he is doing exactly that. According to Yahoo! Sports, Matthew is not making the Lions' decision of who will be the starting QB any easier. He's impressing coaches and teammates alike.
MLive.com - Lions' offense looks much sharper in 7-on-7 drills
MLive.com - Two-Minute Drill Podcast: Only a question of when, not if, Matthew Stafford is Lions' starter
MLive.com - Strong quarterback play, dropped passes the norm in Detroit Lions' morning practice session
DetroitLions.com - Coach Jim Schwartz (Transcript)