Cardiff midfielder Aron Gunnarsson has signed a new two-year contract extension with the club.
Celtic have signed defender Dedryck Boyata from Manchester City on a four-year contract.
Norwich manager Chris Hughton insists he is ready to splash the cash again before the transfer window closes on Monday.
Hughton has brought in six new players to Carrow Road since last season, including Dutch striker Ricky van Wolfswinkel for £8m.
But he is looking to land one more late signing to give the club's Barclays Premier League campaign a boost.
Hughton admitted he has made enquiries about Australian James Troisi, a 25-year-old attacking midfielder he worked with at Newcastle and who currently plays for Atalanta in Italy's Serie A.
"He is one of numerous phone calls and enquiries we have made," Hughton said. "It's normal at this time of the window.
"I knew him at Newcastle. He'd been there for four years before I got there. I'd like to think anybody we would enquire about would have sufficient qualities but he is only one of a few."
Hughton expects a frantic end to the transfer window as clubs scramble to do last-minute business.
"We are trying as hard as everyone else," he said. "Something can be done on the last day in the last minutes. Some clubs haven't done much business and I am sure they will do so over the next three days. It's a very hectic time. Sometimes you spend more time on the phone making enquiries than you want to.
"If we don't (sign anyone) then we are happy with the squad we've got but we are looking anywhere we can improve the squad. Sometimes a name will be thrown in late in the proceedings and it might be one you want to take a chance on. You have to be very open but it has to suit us."
Norwich, who face Southampton on Saturday, have just one point from their first two league matches, having drawn with Everton and lost last weekend at Hull.
However, Hughton, who saw Sweden international loan signing Johan Elmander score twice against Bury in the Capital One Cup on Wednesday, believes he has assembled a stronger squad than last season.
He said: "I'd be the first to admit that by the standards we have here we have spent big. It is something I am grateful for and something I am proud of. The support I have got from the club has been excellent.
"But when you look at what Southampton and Cardiff have spent on individual players it puts it all into perspective. It's a tough league with a lot of very good teams."
Defender Ryan Bennett is "touch and go" for the game against Southampton after needing stitches in an injury sustained in the 6-3 victory against Bury.
Striker Gary Hooper is still out with a shin problem but will start running this week and should be fit for the Tottenham game following the international break.
Hughton hopes the Capital One Cup win will give his side a timely boost.
He said: "We felt hard done by with the penalty we conceded last week but we bounced back in midweek. We were delighted to put in a good performance but to score six goals was really pleasing. We hope it has a good effect."