Gary Caldwell warns that complacency could be "seeping in" at Rangers after an abject draw with Hamilton.
The Premiership champions elect were well below par in Lanarkshire and had goalkeeper Allan McGregor to thank for saving a point.
Manager Steven Gerrard laid into his team after the match, and Caldwell believes that the 21-point gap at the top may have relaxed some minds.
With a European clash with Royal Antwerp looming though, Rangers will have to snap out of it quickly.
Caldwell said on Football Pass: "I think actually the Europa League starting back up again could be a good thing to focus the minds again and get them into a different competition where they have to be at their best.
"I think it's difficult when you're as far ahead as they are.
"Complacency, from a manager's point of view you always have to guard against that and you can see it might be seeping in to Rangers a little bit.
"Performance-wise recently they haven't been as good as they had been earlier in the season and they've just scraped through games that earlier in the season they were winning very convincingly.
"Steven Gerrard will know he has to be on top of the players, the Europa League starting back up again will give them that fresh challenge and might see them kicking on from here."
