The Portuguese teenager became City's youngest goalscorer when he came off the bench to seal a 3-0 FA Cup third-round victory against Watford just over a year ago.
Lopes was aged just 17 years and eight days at the time, and is hoping to get another opportunity to enhance his reputation in round four of this season's competition when City host the same opponents on Saturday.
"Cup games represent a big opportunity for younger the players at the club and I’m looking forward to being involved in more matches," Lopes told the club's official website.
"I was lucky enough to score a goal when I came on against Watford the last time we played them and it's a night I will never forget.
"I can remember everything about it from being named in the squad, to the warm-up and finally the goal.
"Afterwards all my friends and family were congratulating me and as I say, it’s a night I will always remember.
"Now we have Watford again and I hope I can play again or be in the squad because it is a team I will always have good memories of playing against."
Giuseppe Sannino's side are 15th in the second tier and they will be without defender Fitz Hall due to suspension.
