Cardiff's Tanner suffers cut leg after advertising board collapses
The 22-year-old briefly left the field for treatment but was able to return. Assistant coach Omer Riza suggested additional security around the pitch might have prevented fans from coming towards the hoardings.
"That's a heavy sign that fell down there and Ollie's got a big cut on his leg," he added.
"He's OK, he continued and carried on but he had to go off the pitch for 30 seconds and that could have hurt us in that period. All things we can look at to improve."
Tanner said of the incident: "I'll take it if it means we score a goal."
On Saturday, West Ham United players Jarrod Bowen and Tomas Soucek had to rescue a ball boy who was trapped under an advertising hoarding after it collapsed as fans celebrated a goal.