In four more days, Brian Matusz's wait will likely be over.

A day after Matusz allowed one earned run in five-plus innings in a rehab start for Triple-A Norfolk, he rejoined the major league club and Orioles manager Buck Showalter said the lefty will probably make his 2011 big league debut Wednesday, starting the road trip and series finale against the Seattle Mariners. The only hurdle left is a bullpen session Sunday.

"There's a good chance that will happen if things go well [Sunday]," Showalter said. "He hasn't had any problems at all. We feel like he's going to be ready to go."

Projected to be the team's No.2 starter when the season began, Matusz has been on the disabled list retroactive to March 30 because of a strained left intercostal muscle.

In three rehab starts — one at Single-A Frederick, one at Double-A Bowie and Friday's start for Norfolk — Matusz compiled a 1.80 ERA. He allowed two earned runs on nine hits and four walks while striking out 10 over 15 innings.

"It's been a long tough road," said Matusz, who was all smiles as he hauled his suitcase and equipment bag into the visiting clubhouse here. "The DL hasn't been fun. If everything feels good, and it should feel good, I'm lined up to pitch Wednesday. That's the plan. I'm really excited. Right now I'm still focusing on getting ready for Wednesday. I feel good today. I don't feel as sore this time around as I did after the start in Bowie. There are a lot of emotions going on right now. It was a long trip cross-country. I'm just happy to be here in the clubhouse. I'm excited to get back in my old routine."

Matusz, 24, said he made huge strides in his outing at Norfolk. He threw 83 pitches, 53 for strikes, and Showalter said that the reports were that Matusz's stuff got better as the game moved on.