Multiple reliable news outlets have reported that the race to sign Valentin Castellanos is heating up, as reports indicate that Flamengo have now officially submitted a bid for the player as they look to strengthen their squad ahead of the run-in. Talks are expected to continue over the coming days - with Lazio said to be reluctant to let him go for a penny less than their valuation. West Ham are reportedly waiting in the wings. Finalising a fee and payment terms remains central to closing the transfer. Flamengo have been strong going forward this season, with 78 goals scored in 38 games (2.05 per game). Valentin Castellanos would give them depth and keep that attacking firepower going all season. No fresh speculation surrounds Lazio or Flamengo regarding other transfer targets. Want more transfer rumours like this? Follow us on Twitter @PlayerSwitchCom for up-to-the-minute transfer news direct to your feed.