The Swede said: "The championship is not yet over. There's so many games to go and we must not only play but also win. Like we have done so far.
"We have to stay focused and play with confidence. But we also must be careful because there is not only Roma as a pitfall. Now we are first and second, but sooner or later other teams will challenge.
"We have some breathing space, of course, but the championship is so long."