Sunderland were one of the busier sides in the transfer market this summer.
Four Premier League games were played during the window, meaning there was uncertainty over the future of certain players in the league as to whether they would be at the club they kicked the season off with by the time the window had shut.
Defoe is quoted in the Sunderland Echo as describing the speculation as 'unsettling' and 'horrible'.
He said: “I think, obviously, its a distraction for the players being linked with other clubs.
“It’s normal, when you’re playing for a club and there’s talk about you going elsewhere, and bids are coming in. It’s unsettling. It’s normal, and you’ve seen that throughout the window.
“For managers it must be a nightmare. You can imagine as a manger it must be horrible, not knowing if your players are going to stay or go.
“But now that the window’s shut everyone can just relax and get on with their jobs.”
It does make you wonder what effect the window can have on sides as a whole, especially when it comes to clubs like Sunderland who were active throughout the time they could do transfer business, and pretty close to the deadline.
After a start which has seen them take just two points from their opening four games, the Black Cats will be glad of one less distraction going forward as they try to get some wins on the board and pull away from the bottom of the table to ease any early fears they may have.
The side, and head coach Dick Advocaat, now know who they are going to be working with for the remainder of the first half of the season, so on that front they should be a little more settled. Whether that element helps them to get positive results, remains to be seen.