Aldershot have signed Brentford midfielder Emmanuel Oyeleke on loan until 22 December as well as Aaron Wickham, Cameron Brown and Chris Barker on free transfers.
Oyeleke, 20, has made three appearances for the Bees while midfielder Wickham, 19, was most recently on the books at Crawley but never played for them.
Defender Barker, 33, has played almost 500 career games and was recently released by Southend United.
Brown is also a midfielder.
"I've known Manny for several years and he has developed into a very good young player," Shots boss Andy Scott said.
"Chris Barker is well-regarded wherever he's been and we needed an experienced head to guide our younger players along.
"Aaron is a young man with real ability who works very hard, is quick and scores goals and Cameron is one of the most talented footballers, with the ball at his feet, that I've seen for a long time."