the maximum number of Temporary Transfers to any one Club registrable
in the same Season shall be 4 and in no circumstances shall more than 1 be
from the same Transferor Club save there shall be excluded from these
numbers any Temporary Transfer of the kind described in V.7.6.1 or V.7.6.2
Read more in the worlds most boring document: http://www.premierleague.com/content/dam/premierleague/site-content/News/publications/handbooks/premier-league-handbook-2012-2013.pdf (page 180)
Luke Edwards: Bad at life.