Sweepings from the Entry Draft floor in Buffalo:

The Islanders, who have already bade goodbye to top-six winger Kyle Okposo on his way to the July 1 bazaar, appear to be on the verge of losing a second top-six forward in Frans Nielsen to free agency.

And you thought John Tavares was light in the help department last season.

Slap Shots has been told that the Islanders have offered the valuable and versatile 32-year-old center/winger a deal worth at least $5.5 million per, but Nielsen will be able to command at least $6 million per on a contract that will run through at least his age-36 season.

Discussions are expected to continue, but we’re told that the Brooklyn hierarchy is not especially sanguine about its chances of retaining the slick Dane, who played the last four years on a club-friendly cap hit of $2.75 million per.

What’s even worse for the Islanders — who may also lose fourth-line crusher Matt Martin to free agency — is the constant echo reverberating throughout the industry that the unwieldy logistics created by the franchise’s attempt to straddle Brooklyn and Long Island will discourage prime free agents from enlisting.

You should know that those holding that opinion have absolutely no ax to grind with the Islanders. Indeed, several people who took that position over the weekend have nothing but positive things to say about Jon Ledecky and the incoming ownership.

Plus, one agent with a marquee stable of players has told Slap Shots that he would not recommend that his clients sign with the Islanders as a result of the bad ice conditions at Barclays during the playoffs that he deemed “dangerous.”

Sometimes these pronouncements can be hyperbolic, and money can cure many ills, but the perception around the NHL is that the Islanders — hockey department and personnel aside — are not a destination franchise.

This is a critical juncture for the Islanders, who have spent years amassing draft picks and prospects but probably only have this season to cement Tavares’ long-term future with the organization. For if the club cannot attract free agents and can’t keep its own from walking out the door, then what are the odds that No. 91, in a dead heat with Pat LaFontaine as the greatest non-Dynasty player in franchise history, signs on for the duration before he can hit the open market in only two summers?

I could be wrong (more on that later), but if the Rangers were mounting up for a run at Steven Stamkos, wouldn’t they simply have dumped a passel of high-priced assets, beginning with Rick Nash and Derek Stepan or Derick Brassard, at severe discount prices over the weekend in order to clear cap space for that No. 91?

If it is true that Stamkos wants assurance (or, more bluntly, a guarantee) that he will play center rather than right wing before he signs on the dotted line, what happens if somewhere along the line the coach of his new team (if he indeed leaves Tampa Bay) decides that he’s a better fit on the wing?

Because, we’re told, the Lightning’s Jon Cooper isn’t the only coach in the league who believes that is where Stamkos is now at his most effective.

Yes, the Red Wings make perfect sense for Stamkos, especially after general manager Ken Holland’s Christmas-in-June deal Friday night with the Coyotes in which he surrendered essentially nothing to get out from under Pavel Datsyuk’s $7.5 million cap hit, but I’m not so sure Detroit’s the favored destination.

Twin shocks of the weekend felt on the floor: sticker prices established by GMs with players to trade and the Datsyuk deal.

The Rangers, we’re told, intend to touch base with Thomas Vanek and gauge his willingness to sign the type of one-year reclamation contract that Benoit Pouliot did when he joined the Blueshirts for $1.3 million in 2013-14. Pouliot used that season as a springboard to the five-year, $20 million deal he then signed the following summer with the Oilers.

It would make perfect sense, too, for the Islanders to check in on Vanek, who melded beautifully with Tavares (and, uh oh, Okposo) during his 47-game lend-lease tryout with the club during 2013-14.

True enough, Vanek turned down an offer of $50 million of Charles Wang’s cash in order to go to free agency before GM Garth Snow flipped the Austrian to the Canadiens at the deadline for comparatively little in return after sending a bounty to Buffalo to acquire him early in the year, but grudges have no place in the operation of a team.

The Rangers had several conversations with Alexander Radulov, a well-placed source reports, before the Russian reportedly decided to remain in the KHL, that latter news per Sportsnet’s Elliotte Friedman.

We’re told that the Blueshirts do not believe it is essential to add a Russian to the roster in order to ease Pavel Buchnevich’s transition to North America.

Finally, I expect accountability from the athletes and management people I cover, so I certainly must take responsibility for my own errors, including the one a couple of weeks ago where I distributed misinformation about expansion draft regulations.

My fault. And my apologies.