LONDON — Brian Cashman didn’t want to predict how long the Yankees are going to be without Giancarlo Stanton, but don’t look for the slugging outfielder before the final month of the summer.

Stanton sprained the PCL in his right knee sliding into third on Tuesday night against the Rays, and was placed on the injured list for the second time this season.

“I won’t say how long it is going to be at the outset, but it is going to be more than two weeks. I can tell you that,’’ Cashman said Thursday in Finsbury Park, two days before the Yankees and Red Sox clash in the first of two games at London Stadium. “He will be back, but we will get a better feel in the coming weeks about a time frame. I would rather not put a time frame on it.’’

Asked if returning at some point next month was unlikely, Cashman hedged.

“I would say it would be safer to look into August,’’ Cashman said. “I don’t want to say it is unlikely in July, but the sweet spot would be August in terms of not getting burnt. If it is sooner than that I will take it.’’

Essentially the Yankees have forged a seven-game lead over the second-place Rays in the AL East and lead the Red Sox by nine lengths without Stanton. He played the first three games of the season and went on the IL with a strained left biceps. A shoulder issue required a cortisone shot and while on a minor league rehab assignment on May 20 Stanton suffered a left calf problem. Activated on June 18, Stanton played in six games before going back on the IL.

He is hitting .290 (9-for-31) with a homer and seven RBIs in nine games. In the last six — all Yankees wins — Stanton hit .304 (7-for-23) with a homer and seven RBIs.

As he did when Stanton was out the first time, Brett Gardner will play a lot of left field and the Yankees recalled outfielder Mike Tauchman after the results of Stanton’s injury were revealed.