We all knew that Jacob Turner would be coming up on Sept. 1 to make a spot start in the rotation.

The rest of the potential call-ups were a little more up in the air, though.

Thursday, the Tigers announced that they were bringing Carlos Guillen back from his Triple-A rehab assignment, as well as adding Will Rhymes and Andy Dirks from Toledo, along with Double-A pitcher Luis Marte.

It will be the big-league debut for Marte, an undersized right-hander who purportedly has one of the best curveballs in the organization. He was 3-0 with a 1.70 ERA at Erie this season (23 games), striking out 68 and walking just 18 for an amazingly low WHIP of 0.887.

Rhymes started the season as the Tigers' second baseman, then went down to Toledo on May 3, after hitting just .221 with one extra-base hit and two RBI in 20 games. He was back with the big-league club for less than 24 hours three weeks ago, called up as a fill-in on the roster when Guillen went on the disabled list, then sent back down to clear room on the roster for trade acquisition Delmon Young. Rhymes hit .306 with Toledo this season, earning a spot on the International League team in the Triple-A All-Star Game.

Dirks was up with the big-league club for most of the season, making his MLB debut in mid-May and proceeding to hit .256 with six home runs. His late-August demotion was merely a numbers game, as the club needed to find room to recall Brandon Inge from Toledo.

Guillen was placed on the disabled list on Aug. 13 with a sore wrist. He was in Toledo this week on a rehabilitation assignment. He finished 5-for-11 in three games there this week, notching three doubles.

The club also could call up infielder Danny Worth and catcher Omir Santos after the Mud Hens' season ends on Tuesday. Since both had fill-in stints with the Tigers in the last 10 days, by rule they cannot be called up again until the end of the minor league season (barring another injury replacement scenario).