The duo have history from the first leg at the Nou Camp when they locked horns in another frantic match.
It did not end between the two as they had words with one another in the tunnel as they descended for their dressing rooms at half-time.
Robertson started the match fired up and at one occasion risked the wrath of referee Cuneyt Cakir.
As the ball went out for a Liverpool corner, Lionel Messi laid on the deck on the halfway line.
And as Robertson ran forward for the corner, the ex-Hull star shoved both hands into the back of the Argentine’s head.
The incident was not picked up by match officials but it did rile the Barca players, notably Messi and Suarez.
Liverpool will now face either Tottenham or Ajax in the Champions League final, being hosted at Atletico Madrid’s ground the Wanda Metropolitano
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