Flocking to Twitter, many West Ham United fans have raved over the deadline day signing of Croatia international attacker Nikola Vlasic (whufc.com).

The 23-year-old, brought in to supply a much-needed attacking alternative for manager David Moyes, comes with plenty of promise as the Hammers snap up a last gasp forward addition.

Vlasic joins West Ham from CSKA Moscow for an undisclosed fee, which some reliable sources believe to be around €30m (£25.7m).

A former Everton player, the young attacker has been impressing in the Russian Premier League since his departure from Goodison Park and even averaged an incredible 4 shots on goal per 90 and 2.8 key passes - far more than any Hammers managed in the English top flight (WhoScored).

Judging by his statistics, it appears the Irons secured a real threat going forward, and still in his very early 20s, represents real sell-on value too.

Flocking to this announcement, it's safe to see why many West Ham fans have raved over his capture.

Find all of their best reactions from social media down below.

West Ham fans rave over Vlasic signing...

"Another excellent quality signing."

Credit: @transpennineWHU

"GET IN!!!"

Credit: @basmatibonds

"BEST THING TO SEE AFTER WAKING UP SIUUUUU"

Credit: @WHUPawel

"We’re massive"

Credit: @fredfisher_

"We’ve actually just won the league"

Credit: @braadP97

"Just give us the Europa league title now, save everyone’s time."

Credit: @WestHamXtra

"Let’s hope you shine at the London Stadium we need to keep our amazing momentum so proud to see us shining great business for us Hammers"

Credit: @jr_guiseppe

"Get in. Result"

Credit: @LenaWHU

In other news: 'Really stupid', 'Terrible from us'...West Ham fans rage over 'terrible' club decision, find out more here.