Blackpool manager Steve Bruce will miss Saturday’s match against Barnsley following the death of his baby grandson.
In a statement, the club said four-month-old Madison’s passing was “sudden and unexpected”.
“Everyone at the football club sends their love to Steve and his family,” Blackpool said.
“We ask that their privacy is respected.”
Bruce, 63, joined the Tangerines on a two-year deal in September after nearly two years out of football management.
The former Newcastle United and Aston Villa boss has helped the Seasiders into 10th place in League One, losing just one of his six league matches in charge.
Alex Bruce, Steve’s son, will not be in attendance for Salford City’s League Two match against Crewe Alexandra on Saturday.
Salford City said “our love and full support” was with their assistant manager following the death of his nephew.