Sherwood told the Spurs website: "Zeki is one of a number of young players who we have taken an interest in, who play for the reserve teams of different clubs.
"We had the opportunity to bring him in and take a look at him in the summer. We took a mixture of youth and development players to Portugal and took him out with us, basically gave him a trial. We liked what we saw, we knew there was something there.
"He showed potential, a lot of tools there that could make him a player. We played a couple of friendlies and he was definitely of interest to us.
"Our scouts watched him on a couple of occasions. Standard Liege changed their manager in November and the new manager by all accounts didn't fancy him and he then became a little disillusioned and homesick.
"The next thing we knew his representatives called us, along with, as I understand, a number of other clubs, to see if there was any interest in bringing him back.
"Zeki is fully aware that he's a long way away from being ready for Tottenham Hotspur's first team. The plan is for him to come in and work hard with the development squad to get to a level - no guarantees - where he could perhaps play for our first team."