Costa ended a six-game goal drought in last night's win as the Brazil-born hitman finally opened his account for La Roja.
Last night's win represented a much-needed tonic for Spain following a shock 2-1 defeat to Slovakia last week, and the Chelsea striker hopes that he can now lead an upturn in fortunes for the European champions.
"I have to thank the coach [Vicente del Bosque] for his support," Costa told TVE. "Every game he gave me another chance.
"It was starting really bother me. It bothered me that I wasn't scoring but what really bothered me that the team were losing. But this goal will give me a new start."