Goal difference.
It's also worth noting that for Leicester to end up on the same points tally as us (I am assuming purely for the sake of the example that we both finish on 69 points, am not presuming that we will do it) they won't have won their last 2 matches - whereas we will have won 3.
The chances of their goal difference being better than ours are very slim, given ours would go up 3 times - at the absolute worst (three 1-0 victories) improving by +3, therefore I think the prospect of worrying about us losing out on 4th spot due to goal difference is a pretty unlikely scenario unless a Spurs side that are fuelled by a desire to finish above Arsenal/sneak a Europa spot/have Harry Kane setting an example as he tries to get the Golden Boot end up totally folding against a manager who will be on edge about the prospect of bottling a Champion's League spot again.
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