The Spaniard has been out injured for several months with a knee injury.
The 30-year old had been out of action since suffering a hair-line fracture of his kneecap at the end of last season but featured in a couple of Under-21 games before being thrown in at the deep end against Tottenham.
“No, I didn’t expect to play in the starting XI, but I’ve been training hard to be ready,” said Gomez in the Sunderland Echo.
“The manager asked me to play and I did my best…I haven’t had a pre-season with my team-mates, I had to do it on my own.
“But I’ve been training in the gym, doing the running and then playing with the Under-21s… And now I’m back in the team, which is good,” he added.
The Spaniard didn’t have the best of games as he partnered the impressive Yann M’Vila, with the energy and combativeness of Tottenham’s midfield duo Ryan Mason and Eric Dier proving too much in the end.
Despite the result, there were clear signs of improvement for Dick Advocaat’s men and they pushed a talented Spurs side for much of the clash before tiring in the last 15 minutes.
Jermain Defoe looks capable through the middle and made several defence splitting runs only to fail to find the net, and Jeremain Lens is a constant threat.
Ola Toivonen gives the Black Cats a new dimension and with fitness levels sure to improve in the coming weeks, the results should soon follow suit.