Milos Veljkovic returned from a shoulder injury sustained on loan at Charlton in February to captain the team and Nathan Oduwa - currently on loan at Notts County - was back on Under-21 duty at Stevenage.
In a game of few clear-cut chances, the Black Cats took maximum points after a breakaway goal in the first half converted by Duncan Watmore.
The lads pushed for an equaliser in the second half and got into promising positions a number of times without converting. Josh Onomah was denied by Jordan Pickford while Shayon Harrison poked just wide after his pace saw him reach a one-on-one ahead of the Sunderland goalkeeper.
"We have to be careful now that the season doesn't just fizzle out over the last three games and that then reflects on the whole of the season, because that's what can happen," said coach Ugo.
"These are young men and they have to realise when things are going badly that you have to go back to basics and work even harder.
"Then, if the chances don't come, I'll take that. In the meantime, there is more work to do. We'll have to dust ourselves down before we play City on Monday."
Ugo was disappointed with aspects of the performance. "I can't believe we conceded on the counter-attack," he added. "It's something we spoke about and we have to learn from that.
"We had two or three chances but it wasn't to be. It was a frustrating night because we worked on a lot of good things but small details cost us."
Below: Ugo speaks to Spurs TV at Stevenage last night