Auburn Hills — The Pistons may be in trouble at point guard.

Backup Brandon Jennings, who still is rehabilitating from a left Achilles injury, will miss training camp and might not return to five-on-five drills until November.

That means means veteran Steve Blake (12 seasons, 10 teams) will battle second-year man Spencer Dinwiddie to back up starter Reggie Jackson.

Dinwiddie showed flashes last season, but struggled during the Orlando Summer League, turning the ball over and failing to run the team consistently. Pistons coach Stan Van Gundy believes knee surgery had something to do with Dinwiddie’s inconsistency.

Jennings, who is shooting and running on treadmills and in the pool, won’t be the only veteran to miss training camp, which begins Tuesday.

Danny Granger, obtained along with Marcus Morris and Reggie Bullock in a trade with the Suns, will remain in Phoenix to rehab a bad knee. A former All-Star with the Pacers, knee problems have threatened Granger’s career. He has played in 76 games the last four seasons with three teams.

Slam dunks

Pistons center Aron Baynes is still recovering from right ankle surgery and will participate in one of the two-a-day sessions. He was signed as a free agent after playing for the Spurs.

... The Pistons host a public practice at 11 a.m. Oct. 3 at The Palace. Admission is free.