The 19-year-old will be a key figure in the home A-League Men (ALM) clash with Sydney FC on Friday night after scoring seven goals in 23 games in his debut season.
Australian U20 and U23 representative Waddingham has already been linked to a move to Tottenham in England, German giants Bayern Munich and Serie A club Udinese in Italy.
Departed Socceroos coach Graham Arnold was keeping a close eye on him before exiting the role now held by former A-League coach Tony Popovic.
"I don't think we would ever stand in his way," Zadkovich told AAP of a Waddingham move.
"We would love to see him progress to the highest levels. That takes time and it takes the right club to come in at the right time at the right price. It has also got to be the right move also for Tommy.
"That hasn't happened yet, which is a benefit for us because we get to keep one of our good young talents and keep working on his game. He is a great young player with a great attitude. There are a lot of areas for growth in his game but he is a young attacker who will only get better."
Thomas Waddingham has a shot during Brisbane's opening game of the season in Auckland. (Brett Phibbs/AAP PHOTOS)
Waddingham is a physical presence and uses his size to hold up the ball and keep defenders at bay, similar to Mark Viduka back in his playing days.
Radkovich said he was also a student of the game and watched other forwards closely without being prompted.
"I also get him to take a look at other strikers' games and it can be clips from players in this league," he said.
"Guys like Adam Taggart (of Perth Glory), someone I have worked closely with, and also guys that play in higher leagues. I try and take different components of different strikers and mould it to suit Tommy. His attitude is so good and he wants to improve so it is an enjoyable process."
Players come and go in the ALM and Radkovich said the club had contingencies for a possible Waddingham exit.
"If he goes with a fee, there will be a fee there for us to try and strengthen our squad," he said.
"There are other young players we have like Jacob Brazete who we have on a scholarship from Sydney FC. He is a winger that I could see play a big part at the right time.
"We always have a contingency but at the moment Tommy is ours. If he leaves we will work on solutions."
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