Irving, TX -- (Sports Network) - The Dallas Cowboys started their three-day mandatory mini-camp on Tuesday without star wideout Terrell Owens, who missed practice with what team officials termed as a personal matter.

Owens signed a three-year, $27 million contract extension earlier this month before news broke that he was placed in the NFL's "reasonable cause" testing program after missing a drug test. The veteran wide receiver attributed the missed test, and subsequent missed calls by the league office to Owens, to a mix-up of phone numbers. Nevertheless, Owens will be subject to as many as 24 random tests in the next calendar year.

The mercurial star was at Valley Ranch for a physical on Monday, and attended a team meeting on Tuesday before leaving.

The 34-year-old Owens caught 81 passes in 15 games for 1,355 yards and 15 touchdowns last season. In 12 NFL seasons with San Francisco, Philadelphia and Dallas, Owens has recorded 882 receptions for 13,070 yards and 129 touchdowns.