Bale has scored 22 goals in all competitions during a season that has seen him nominated for both the PFA Player and Young Player of the Year awards, increasing speculation linking him with a summer transfer.
However, with the Welshman due to undergo a late fitness test ahead of Tottenham’s clash with Manchester City on Sunday, Sigurdsson is confident Bale will not let the hype that surrounds him disrupt his "fantastic" form.
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"Obviously, a Champions League spot would be fantastic for the club and for Gareth. If you’ve got top players, there is always going to be speculation about them leaving or staying.
"Gareth deserves all of the credit he gets because he has been fantastic. He’s been scoring many goals this season.
"Everyone has been looking at him and comparing him with the great, great players. He is a fantastic player, that’s why there has been so much high praise.
"If anything, he is too childish. He’s a nice guy, a normal guy who is cracking jokes with everyone. Everyone likes him."
Sunday’s clash will also see Sigurdsson cross paths with former Swansea team-mate Scott Sinclair, who has struggled for playing time since swapping South Wales for Manchester City.
"It’s difficult when the champions come in for you – it was probably impossible for him to say no to them," he added. "So I feel a bit sorry for him about how little he’s played.
"Sometimes you just don’t get a chance at a big club like Manchester City. But I’m sure he’ll do well in the future."