United head to Somerset with a one goal lead and Porter is encouraged by the Blades last two results in the West Country, although he is adamant nothing can be taken for granted against the Glovers:
"We have won on our last two visits to Yeovil, so we know what it takes to get a win down there.
"After what happened last season we are doubly determined to go one better this season, but first of all we have to get a positive result on Monday.
"We are satisfied to be a goal up after the first-leg and we can go to Huish Park full of confidence.
"I think we edged the game on Friday night and deserved to win, arguably we could have scored more, but we are very much in the tie.
"The crowd were excellent at Bramall Lane, but like the players, they will know there is still work to do.
"The manager will keep the lads focused and we head to Yeovil with our minds firmly fixed on the challenge ahead."
Reserving a special word for Friday's match-winner, Porter, who scored the Blades crucial semi-final goal against Stevenage last season, added:
"What a time to score your first senior goal, but it was the least Callum (McFadzean) deserves.
"He has come on leaps and bounds in the last few months and he is certainly taking his chance with both hands at the moment."