Darren Moore reckons the number of Championship games caught up with Albion against Nottingham Forest.
The Baggies resuced a point thanks to Jay Rodriguez's late penalty after Dwight Gayle's tumble in the area.
Albion were slow out of the blocks and twice had to come from behind against Martin O'Neill's men.
“We weren’t our fluid selves and it was difficult," admitted the Albion chief.
“Obviously they got their 2-1 lead and defended very, very deep and got ten men behind the ball - so I’ve got to be pleased with the resilience that we showed coming back to earn a point so late in the game.
“The display was a little bit lethargic, not from one or two but from the whole team.
“Whether it’s the volume of games or the quick turnaround, I don’t know the reason tonight but everyone was just a little bit off colour.
“But credit to the boys, they kept going and that’s the beauty of them. They’re an honest group of boys and they kept going. Credit to them that they’ve salvaged a point out of the game.”