Portsmouth have completed the double signing of Hayden Mullins and Portuguese midfielder Pele.
Pompey boss Tony Adams has been looking to bolster his midfield all month after losing Lassana Diarra to Real Madrid and Papa Bouba Diop to a long-term injury.
West Ham have decided to let Mullins move on as Hammers boss Gianfranco Zola looks to trim his squad and balance the books at Upton Park.
Mullins has agreed terms on a three-and-a-half-year deal and passed a medical to join Pompey.
Pele arrives on loan until the end of the season from Porto and the 21-year-old is relishing the prospect of playing in England.
"I only heard about Portsmouth's interest a few days earlier but I wanted to come straight away," Pele told the club's official website.
"I'm very happy to be playing for such a club."
The midfield duo could make their debuts in Tuesday's Premier League clash with Aston Villa, live on Sky Sports 1.