Wigan chairman Dave Whelan will demand answers from Roberto Martinez at a meeting on Monday morning after the Latics slumped to a dismal 2-0 home defeat to 10-man Swansea.
The Latics remain rooted to the foot of the table after goals from Gylfi Sigurdsson proved the difference at the DW Stadium.
Wigan began the match with Victor Moses, Hugo Rodallega and Mohamed Diame on the bench and have now gone 12 home games without a win.
Whelan was unimpressed with the display - branding it the worst he has seen for several seasons - but insists Martinez's job is not at risk.
He said: "That was our worst performance in four or five years.
"I will have a meeting with him on Monday morning and ask him some questions about the performance and his selection.
"We had three quality players on the bench and I want to know why."
Whelan added: "Roberto Martinez's future is secure. He has done a great job for the club.
"But we will have a meeting on Monday when he will put his cards on the table and I will do the same."