BRISBANE Roar coach Ange Postecoglou has a warning for the rest of the A-League - re-signed striker Besart Berisha is only going to get better.

On a day when the door was finally shut on Matt McKay returning to Brisbane for the club's Asian Football Confederation Champions League assault, the Roar secured the Albanian international for a further two seasons despite overseas interest in his services.

The Courier-Mail last month revealed Berisha, who has already scored 13 goals this season to lead the race for the Golden Boot, wanted to commit his long-term future to the Roar.

"The important thing is that I enjoy being in Brisbane and I really want to stay," Berisha said.

Postecoglou yesterday re-iterated the 26-year-old forward's desire to remain with the Roar, but was nevertheless relieved to have finally completed the deal.

"I'm pretty happy to get him signed on for another couple of years," the Roar mentor said.

"With him being top goalscorer in the league, there were other clubs who were interested in him, but as long as we could come up with the right deal for him, he'd be happy to stay, and I'm pretty pleased we came up with something."

Berisha joined the Roar late in the off-season but made an immediate impact, scoring nine goals in his first eight games for the club.

He then failed to score for eight matches but has since found the net four more times.

"I'm sure he can improve on what he's been doing," said Postecoglou, who felt imports usually got better in their second season in Australia.

"That has been traditionally the history of the A-League. It's always hard for foreigners to come in and click straight away."

Berisha has also made headlines off the field for clashes with Sydney FC defender Pascal Bosschaart and his own teammate James Meyer.

But Postecoglou said such emotion and passion made him one of the club's most popular players.

"He's passionate about his football, he's passionate about the club and his teammates - that's one of his strengths and that's one of the things we like having around the place," the Roar coach said.

But McKay won't be "around the place" - at least not before next season - despite his current club Rangers having announced their intention to enter administration due to debts threatening to reach more than $A110 million.

With the A-League transfer window having closed last night, McKay's agent Leo Karis said that even if the Scottish club was to terminate the Socceroos' midfielder's three-year deal, the earliest he could return to Brisbane would be when the new window opened ahead of the 2012-13 season.

However, with current windows in Korea, Japan and China still open, McKay could still be sold to an Asian club in the coming weeks.

Postecoglou's next task is to re-sign star Bahraini defender Mohamed Adnan.

"We're talking about one of the best defenders in Asia, so it's not going to be easy to keep him, but that's our intention," Postecoglou said.

Originally published as Best of Besart still to come: Ange