Morrison and his Scottish teammates are preparing for their final two Euro2012 qualifiers - firstly against Liechtenstein in Vaduz on Saturday - before a potential must-win encounter with the Spaniards in Alicante on Tuesday.
The Baggies star says all the players in the squad are confident of getting a positive result in both matches and pushing into the European Championship finals to be held in Poland and Ukraine next summer.
"Not one of the boys who has joined the squad has given up on this. We are still convinced we can get a play-off spot, despite the fact we've been written off and need the (second-placed) Czechs to slip up," he told the Daily Record.
"We have to take it until the last game and defeating Liechtenstein is the first task. If we can get the right result we'll go into the last match with a chance and you just don't know what can happen over a single 90 minutes.
"We won't be given a chance against Spain. They are the world and European champions and are strong favourites to beat everyone. But how many people gave Scotland a chance of beating France in Paris during the last Euro campaign?
"Probably the same amount as fancies us to beat Spain but we beat the French 1-0, so it can be done and we will not give this up until the last minute.
"The boys are desperate to get back into a major finals. It would mean loads for the supporters but also for the players and we believe it's still there for us."
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