Watson told reporters "it would have been hell" if the fifth-year receiver had ended up on a different team at the deadline.
"It would have been hell if they would have did that, for sure," Watson said. "Honestly. I'm glad to continue to play with Will. We've been making a lot of big, big plays since I came into this league, [and we're] going to continue to do that as we continue to go the rest of this year and hopefully the rest of our careers."
During Sunday's 27-25 win over the Jacksonville Jaguars, Fuller scored a 77-yarder to continue his streak of games with a touchdown reception, which is now up to six. He ended the day with five catches for 100 yards, his fourth 100-yard game this season, and is up to six touchdowns thus far.
"To be honest, it really sucked being shopped around like that, giving this organization my all, very unselfish player," he said. "To be shopped around, I did feel a certain kind of way. I'm happy to be here."
The 26-year-old, who was drafted at 21st overall in 2017 out of Notre Dame, is playing on a fifth-year option this season, worth $10.16 million. He earned the starting role in the Texans offense this year after DeAndre Hopkins was dealt to the Arizona Cardinals this offseason. He had served as the team's secondary wideout for four seasons, though his 2018 campaign was cut short following an ACL tear in Week 8.
But as he serves in a larger capacity for the 2-6 Texans, Fuller is happy to remain in Houston.
"It means a lot," Fuller said about staying in Houston. "I want to be here. I love it here."