Conversation so far:
When did Dalglish play with Liverpool?
After the Heysel Stadium disaster in 1985 and Joe Fagan's subsequent resignation as manager, Dalglish became player-manager of Liverpool.
How did the team do in under Dalglish?
In his first season in charge in 1985-86, he guided the club to its first "double".
Liverpool achieved this by winning the League Championship by two points over Everton.
Did he come back for the 86-87 team?
The 1986-87 season was trophyless for Liverpool.
They lost 2-1 to Arsenal in the League Cup final at Wembley.
Before the 1987-88 season, Dalglish signed two new players.

Question: Who did he sign?
Self-contained rewrite: Who did Kenny Dalglish sign before the 1987-88 season?