TORONTO - Slugger Jason Giambi will stay home until the New York Yankees receive test results that show why he’s felt so weak for so long, general manager Brian Cashman said Thursday.

Diagnosed with an intestinal parasite on June 29, Giambi has been fatigued for much of the season. He was out of the starting lineup for the sixth straight game when the Yankees opened an 11-game homestand Thursday night against Baltimore.

“There’s definitely things going on here,” Cashman said, without elaborating.

The Yankees hoped to get some answers earlier this week after Giambi went through extensive tests at Columbia-Presbyterian Medical Center. Diagnosed with an intestinal parasite on June 29, the former AL MVP is batting only .221 with 11 home runs and 36 RBIs. He’s in an 0-for-21 slump.

ESPN said it was possible that Giambi would miss the rest of the season to undergo treatment for the condition. ESPN also reported that the Yankees have contacted former Seattle Mariner first baseman John Olerud.

“It’s different levels of doctors in different fields,” Cashman said. “It’s taken longer, but so be it.”

Giambi remained unavailable to play and had not appeared in the Yankees’ clubhouse 70 minutes before gametime.

“Until he finds out completely, he’s curious, worried,” Yankees manager Joe Torre said. “He’s not feeling the way he should. Sure, he’s concerned.”

Kathy Willens / AP Kevin Brown is 7-1 with a 4.13 ERA in 13 starts for the Yankees.

Meanwhile, pitcher Kevin Brown is still slated to make his return from the DL with a start on Friday against the Orioles.

Brown, sidelined since June 9 with a lower back spasm and an intestinal parasite, threw a bullpen session Wednesday and felt good.

Brown said he’d let the team decide whether he starts Friday’s game. He is 7-1 with a 4.13 ERA in 13 starts for the Yankees. The 39 year-old Brown has felt weak for months because of the parasite.

On Monday, Giambi played down a report that he was being checked for a parasite that can cause a potentially fatal condition.

“We’re not in a third-world country, so we have medication,” he said.

Giambi’s trainer, Bob Alejo, told the Newark Star-Ledger that the All-Star first baseman is being tested for a dangerous parasite called entamoeba histolytica.

The 33-year-old Giambi has missed six of New York’s last seven games, including Tuesday night. He is hitting just .221 with 11 homers and 36 RBIs. The 2000 AL MVP, who did not start in eight straight games from June 26 to July 4 because of the parasite, is in an 0-for-21 slump.