The pair both started the game with Ouahabi completing the full 90 at left-back, while defensive midfielder Aleixandri was replaced on 70 minutes.
Goals from Klara Buhl and Alexandra Popp clinched victory for Die Nationalelf at the Brentford Community Stadium to secure a place in the quarter-finals.
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The clash was billed as the game of the group and yielded the opening goal inside three minutes, as Buhl capitalised on a poor clearance from goalkeeper Sandra Panos and drilled into the far corner.
Spain responded well to the setback and perhaps should have found the leveller when Lucia Garcia Cordoba latched onto Patricia Guijarro’s excellent through-ball - but the forward took the ball too wide when rounding Merle Frohms and could only find the side-netting.
Guijarro then tried her luck with a low drive which bounced comfortably into the arms of the Germany ‘keeper, while Mariona Caldentey curled just over the bar and Sheila Garcia also blazed off-target.
Germany doubled their lead against the run of play from Felicitas Rauch’s corner delivery, as Popp’s header took a slight deflection to claim a commanding advantage.
Desperate for a route back into the game, Spain pressed with Aitana Bonmati clipping just wide but La Roja headed into the break trailing by two.
Germany continued to threaten from set-pieces and almost made it three a minute after the restart when Popp headed another corner wide.
Spain meanwhile were limited to half-chances in the second period until 20 minutes from the end when Caldentey drew the best from Frohms with a side-foot volley. It would be the closest La Roja came to a goal.
At the other end, there was a moment of controversy when Irene Paredes’ thwarted Popp’s clear route to goal with no consequence before Tabea Wassmuth had the ball in the net for a third time, rounding Panos and slotting home - only for the flag to be correctly raised for offside.
Two goals would prove enough to clinch victory however, lifting Die Nationalelf top of the group and into the last eight.
Spain need a positive result against Denmark to progress with the pair locking horns on Saturday 16 July - also at the Brentford Community Stadium (20:00 UK time).
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