NEW YORK -- Left-hander John Danks left the team and returned to Chicago for further tests on his ailing left shoulder.

Danks, who is on the disabled list, will undergo a diagnostic ultrasound and is expected to return to his normal program on Tuesday.

"We want to get him healthy first and it keeps lingering and lingering and you can't look at him as we're counting on him on this [particular] date,'' manager Robin Ventura said. "Every time we've done that, it's been pushed back. Just get him healthy and [Jose Quintana] just stays in that spot."

Rookie left-hander Jose Quintana (3-1, 2.19 ERA) has been more than an adequate replacement in the rotation for Danks, who signed a five-year, $65 million contract extension during the off-season.

"We're fortunate ... with what Q has done,'' Ventura said.