John Rocker might not be up to replacing the injured Jeff Zimmerman as Texas’ closer.

Rocker allowed four runs in one inning during an 11-8 loss to the Boston Red Sox on Tuesday after Zimmerman was placed on the 15-day disabled list with tendinitis in his right elbow.

“I need to make a few more quality pitches. I did some good things, and I’m trying to focus on them,” Rocker said.

Zimmerman, who hasn’t pitched since March 6, is expected to miss at least one month. The news was better on Rangers starter Ismael Valdes, who returned to Florida on Tuesday night after tests showed no ligament damage in his right elbow.

Elsewhere, Moises Alou played for the first time in more than a week, going 2-for-3 with an RBI in the Chicago Cubs’ 13-11 loss to Oakland in Mesa, Ariz. Alou had been sidelined for much of the spring with a strained muscle on his left side.

“I’m feeling OK,” he said. “I think I’m going to be all right. Just get in these final three or four games, and tune up for the opening of the season.”

Miguel Tejada’s two-run homer capped a seven-run Oakland rally in the eighth inning. Sammy Sosa, Chris Stynes and Joe Girardi homered for the Cubs.

Marlins catcher Charles Johnson returned to limited action, catching and hitting for the first time in three weeks. But the two-time All-Star likely won’t be ready for the season opener.

Johnson sprained his left thumb March 5 when he ran into Montreal first baseman Joe Vitiello. He wore a cast for two weeks, allowing swelling and soreness to subside, then regained strength and flexibility during the past week.

Johnson eased back into baseball activities Tuesday, catching soft toss and hitting off a tee.

“It’s an injury that I have to be concerned about,” Johnson said. “I can’t rush it because it’s my thumb. With me being a catcher, I’m dealing with this thumb every pitch, every time a guy throws a baseball and every time I swing a bat. I have to be very careful.”