Keane has made a big impression at Villa, scoring three goals in two league starts, and Villa were hoping he could remain with them for a further week.
But the Galaxy want Keane to return after playing at the DW Stadium to prepare for the new Major Soccer League season which starts on March 10.
Keane will feature in Sunday's Barclays Premier League meeting with Manchester City but Villa's FA Cup exit means he will have a two-week wait before his final appearance against the Latics.
Source: PA
Source: PA