The front man, who joined the Rams on loan last week, came on at half-time at Vicarage Road, as Derby took the lead three times on the way to a 3-2 victory in the Championship, with fellow substitute Connor Sammon netting the winner two minutes from time.
Simon’s Spurs colleague Adam Smith was, as usual, a key figure at the back for Derby – although he was one of three visiting players who picked up a caution as Watford put their visitors under pressure throughout the game.
Elsewhere in the Championship, Benoit Assou-Ekotto played 90 minutes as Queens Park Rangers conceded a late equaliser at Millwall. Jermaine Easter’s stoppage time leveller claimed a point for the hosts, the game ending 2-2.
Tom Carroll missed out through an ankle injury picked up on duty for England Under-21s last week.
Bongani Khumalo’s Doncaster Rovers side suffered a 4-1 defeat at Reading in the same division. With Reading 2-1 in front, Doncaster lost Rob Jones to injury, but with Rovers having made all three allowed substitutions, they were forced to play on with reduced numbers, with the hosts taking full advantage.
Elsewhere, Jake Livermore was in action for Hull City as they slipped to a 2-1 defeat at Everton in the Premier League.
Jake was unlucky not to put the Tigers ahead in the second half with the scores level at 1-1, as his shot glanced wide off team-mate Yannick Sagbo. The Toffees went on to win the game through former Spur Steven Pienaar.
All three of our on-loan lads featured for Swindon Town as they claimed a 2-0 win over Notts County in League One.
With Grant Hall as solid as ever in defence, Alex Pritchard provided the cross for Nile Ranger to put the Robins in front on 11 minutes.
Ryan Mason made his return from injury when he stepped off the bench to replace Alex with 13 minutes remaining.
Swindon’s other goal came courtesy of a Dany N’Guessan penalty on 28 minutes.
In Spain, Yago Falque started for Ray Vallecano as they claimed a 1-0 win over basement side Almeria. Yago was withdrawn mid-way through the second period.
And in the Portuguese Cup, Cristian Ceballos proved a key figure as FC Arouca beat Varzim 4-1.