SYDNEY Swan Lance Franklin has no ongoing concerns ahead of the season despite the $10 million man suffering a seizure in January, his manager says. 

Franklin, who made a high-profile switch from Hawthorn in the off-season, was taken to hospital after the second seizure of his career.

The first was while he played for the Hawks 'a couple of years ago', his manager Liam PIckering said. 

"He had one at Hawthorn a couple of years ago, a similar type thing. It's rare, but it happened on January 3. I'm surprised it's taken this long to come out as a story," Pickering told Off the Bench. 

"It'd be a big story if it happened yesterday but you saw him two nights ago [against West Coast] and he played."

Pickering backed up the Swans'  comments that drugs or alcohol did not cause the seizure but he would not be drawn on what led to the issue. 

"I'm not going to go into it ... it's a private medical thing, do you reckon I'm going to talk about it? He missed a day of training, everything was fine and he's back playing.

"He's good as gold." 

Pickering said Franklin's diet and training did not need to be modified and he was confident the issue would not reappear. 

Pickering was with Swans coach John Longmire when he was told of the incident and said he kept in constant contact with Franklin's partner, Jesinta Campbell, while Franklin was hospitalised. 

The Swans confirmed on Friday that it was a precautionary measure which would have no "ongoing impact on his football", and that neither drugs nor alcohol were factors in the scare.

Franklin is one of the League's most damaging forwards, a former Coleman medallist and his signing with the Swans is considered the coup of the off-season.

He signed a nine-year, $10 million deal with the Swans at the end of last year.

Franklin played in the Swans' 10.12 (72) to 5.7 (37) loss to West Coast on Thursday, having little impact on a dire night for the Swans.

But club officials are also confident there will be no long-term concerns surrounding the 27-year-old's future.

"This was a minor medical matter and Franklin returned to training after missing just one session," the club said in a statement released to News Ltd.

"Since then, Franklin has felt no ill-effects as a result.

"This is a private medical matter, and as to avoid any unnecessary speculation, Franklin's doctors confirmed that neither alcohol nor drugs played a role."

The Swans open their season away to cross-town rivals Greater Western Sydney on Saturday March 15.