Euro 2012 play-offs: The other games
Not much of a reward for Bosnia's heroics in Paris, but the Portuguese will be taking nothing for granted.
They may have Cristiano Ronaldo and Nani, but Bosnia are well-organised, very determined and have Edin Dzeko. Nevertheless, Portugal should have the edge.
Montenegro will feel they have a chance against one of the weaker Czech teams of recent years, one which was fortunate to finish above Scotland in qualifying.
They will certainly worry the Czechs if they can reproduce the intensity they showed in the second half against England in Podgorica last week.
A repeat of the dramatic Euro 2008 quarter-final when Croatia scored in the last minute of extra-time, only for Turkey to snatch an equaliser and win on penalties.
It could be just as hard to separate the teams, neither of whom are as strong as then, and both of whom failed to reach the 2010 World Cup. Second-leg home advantage may tilt the tie Croatia's way.