There are three guarantees in life: death, taxes and Manchester United head coach Ruben Amorim mixing up his back-three.

Four games into United's pre-season campaign and the Portuguese chief has already deployed four different centre-back combinations.

Pre-season is as good a time as any for any manager or coach to experiment and test the water, but the level of tinkering usually slows the closer the start of the season gets. Over the course of United's first four friendlies, Amorim has made a total of 18 changes to his starting line-up.

Saturday's visit of Fiorentina to Old Trafford will mark the Reds' final warm up match ahead of the competitive action getting under way next weekend. Arsenal will visit M16 a-week-on-Sunday for what promises to be exciting curtain-raiser.

With a l

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