Joelinton hadn't struck since August 25.
Lascelles, who was on the sideline having been substituted following his return from an 11-game absence with a fractured tibia, said: "You could see everyone's reaction the minute he scored. I was jumping up and nearly went on the pitch!
"He's a really good player and it's tough for him. He's playing up there by himself most games and fighting centre-halves. He does do a lot for the team and now he's got a goal.
"Hopefully it can give him the confidence to start banging in more goals for us.
"He's a great professional. He's there early and puts in the work at training, is in the gym and keeps his head down and doesn't moan about anything.
"He genuinely does care and works hard for the club, so I was over the moon for him to get a little relief and hopefully it can boost him for more games to come."
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