The Baggies boss bemoaned his team's shaky start to 2013 and called upon his players to increase their work rate and grind out results.
"It's not been a good start to the year for us. We gave ourselves too much to do and we have been doing that too much recently. Of course it's a worry if you give two goals away, it's very unusual you come back," BBC Sport quotes him as saying.
"Maybe with a bit more composure we could have got something out of it. Graham Dorrans was unlucky with the free-kick against the crossbar. We need to dig in. The harder you work, the luckier you get."
The result leaves West Brom in ninth place in the Premier League, four points clear of mid-table Stoke City.