I won against an opponent more stronger just like in your case in the champion league's quarter finals by playing normal and switching counter on, hitting flanks too. I feel defensive strategy will invite more pressure on you, it's difficult to concentrate for 90mins you know. What I have deduced from playing normal is that your player maintain their shape and chose wisely, the attacking moments. so I would play normal instead of being defensive. You could consider playing a 3man defence since he has just a strike so that you could employ that man in midfield. Goodluck

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