Colts guard Donald Thomas leaves practice early

AP

The Colts need to do a better job of protecting quarterback Andrew Luck, and that job didn’t get any easier today.

According to Stephen Holder of the Indianapolis Star, guard Donald Thomas is believed to have re-injured his quadriceps, and left the practice field early. He’s expected to have an MRI to determine the severity.

Thomas played just two games for the Colts last year before tearing his quadriceps tendon, sending him to injured reserve. The rehab process also kept him from participating in OTAs this year.

The Colts signed him to a four-year, $14 million deal last offseason, and haven’t gotten much of a return on that investment.