The 17-year-old has continued to impress in the club’s Under-18s but he has yet to make the step up to the first team.
He has been named on the bench and manager Tony Pulis has allowed him to travel with the team in recent months to away games.
After starting the season in the Under-18’s he has also played for the club’s Under-23 side and Pulis is reportedly ready to secure his long-term future.
With just five games left of the Premier League season, Harper may make his first-team debut in the coming weeks as Pulis looks to give him a taste of first-team football.
Javi Gracia said it was always going to be an uphill battle for Watford after conceding so early against Liverpool on Saturday.
Schalke 04 boss Dominico Tedesco paid tribute to goalkeeper Ralf Fahrmann after his 76th-minute penalty save proved crucial in a 1-0 win over Wolfsburg.
Mattia De Sciglio stunned that Juventus were shocked to be held to a goalless draw with SPAL on Saturday.
Sunderland have suspended midfielder Darron Gibson with immediate effect after he was charged with drink driving.
Jose Mourinho's recent bad frame of mind was still present despite Manchester United beating Brighton 2-0 at Old Trafford on Saturday, a result that puts them into the last four of the FA Cup.
Mohamed Salah continued his astounding goalscoring form on Saturday, hitting four goals as Liverpool thrashed Watford 5-0 at Anfield.