ALS (ASX:ALQ) is expected to disclose a "strong" fiscal second-half guidance after raising $2.7 billion for exploration in October, according to a Friday Jefferies note.

The Environmental division is expected to be only mildly positive, with stronger activity in North America, difficult conditions in Europe, and modest improvement in residential testing in Australia and New Zealand, partly offset by weaker non-residential activity, the note added.

Jefferies said that the above renders position ALS as a double-digit earnings per share growth story over the medium term.

Jefferies kept a hold rating on ALS with a price target of AU$23.

The company's shares fell past 1% in recent Monday trade.