Allen & Overy’s leadership could face an uphill battle to convince London partners of the merits of the proposed merger with O’Melveny & Myers, according to sources close to the discussions.

The American Lawyer and its London-based sibling publication Legal Week reported last week that Allen & Overy is discussing a tie-up with the Los Angeles-based firm. But multiple partners have since told Legal Week of reservations among Allen & Overy’s London-based ranks.