Sorrell probe findings could land next week
Sorrell's leadership of the world's biggest advertising company has come under threat by an allegation of misconduct, which prompted WPP's board to launch an internal probe.
WPP's joint chief operating officers Mark Read and Andrew Scott have said they do not believe a break-up of the ad group makes sense.
Seifert said feedback from clients has been positive.
The healthcare marketing group made another major acquisition in the country last month.